Grass and Forage Science最新文献

{"title":"Utilizing treated wastewater for pasture irrigation: Effects on productivity, plant community structure and soil properties","authors":"Renana Lavi,&nbsp;Avi Bar-Massada,&nbsp;Guy Dovrat","doi":"10.1111/gfs.12652","DOIUrl":"10.1111/gfs.12652","url":null,"abstract":"<p>Surplus wastewater accumulates in winter and requires a discharging solution. In our study we examined the effects of using treated wastewater (TWW) as supplemental pasture irrigation in winter. To test the effect of TWW irrigation on the vegetation and soil, 10 grazing prevention exclosures were established at Ramat-Hanadiv Park, Israel, with half of them irrigated with TWW. Soil and vegetation were sampled during 2 years of irrigation and 1 year after cessation of irrigation. Vegetation composition, species richness, and productivity were sampled at the peak of the growing season and various indices of herbage quality were measured. Our results show that irrigation with wastewater increased herbage production by an average of 38% and total pasture protein production by 9% relative to the control subplots. Conversely, TWW irrigation decreased plant protein content while increasing herbage fibre content and lowering its digestibility. Over a period of 2 years, species richness decreased in the irrigated subplots. Most of the soil indices examined were not affected by irrigation, but in the irrigation subplots, sodium values and the sodium adsorption-ratio were higher than in areas without irrigation. Additional resources in winter enabled the plants to grow rapidly and increased interplant competition. Changes in vegetation composition were revealed through functional group reshuffling and species richness decline. The results of our study show that wastewater irrigation causes an increase in productivity but a decrease in forage quality. At the pastoral system level, the significant increase in productivity leads to increased availability of protein and herbage for animals.</p>","PeriodicalId":12767,"journal":{"name":"Grass and Forage Science","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Removal of autumn-growth herbage using sheep: Effects on yield and quality of first cut silage and subsequent cow performance","authors":"Aimee-Louise Craig,&nbsp;Alan W. Gordon,&nbsp;Conrad P. Ferris","doi":"10.1111/gfs.12654","DOIUrl":"10.1111/gfs.12654","url":null,"abstract":"<p>Grass which grows during the autumn is perceived by some farmers to have a negative impact on the nutritive value of silage produced the following spring. The impact of removing herbage in the autumn using sheep, on silage yield and quality the following spring, and on performance of cows offered these silages, was investigated in two experiments. Following harvest of third-cut silage in September, a grass sward was split into blocks which were either grazed by sheep during November and December or left ungrazed. Herbage was harvested and ensiled the following May and offered to late-lactation Holstein cows in a two-period balanced change-over design feeding experiment comprising two 28-d periods. In Experiment 1, silage quality was unaffected by autumn grazing treatment but in Experiment 2, silage from swards grazed in autumn had a higher metabolizable energy concentration (0.5 MJ kg⁻¹ dry matter [DM]; <i>p</i> = .016). In Experiment 1, intakes were unaffected, while cows offered silage from the grazed sward (GS) had a greater milk (0.8 kg d⁻¹; <i>p</i> &lt; .001) and protein yield (0.03 kg d⁻¹; <i>p</i> = .014) than cows offered silage from the ungrazed sward, but fat plus protein yield was unaffected. In Experiment 2, cows offered GS had greater DM intake (1.5 kg d⁻¹; <i>p</i> &lt; .001) and fat yield (0.15 kg d⁻¹; <i>p</i> = .047), but fat plus protein yield was not significantly different between treatments. In conclusion, winter grazing using sheep has potential to improve silage quality, but with marginal benefits on individual cow performance.</p>","PeriodicalId":12767,"journal":{"name":"Grass and Forage Science","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Herbage accumulation, nutritive value, and fatty acid profile of bermudagrass cultivars grown in different latitudes","authors":"Igor L. Bretas,&nbsp;Harley D. Naumann,&nbsp;Jose C. B. Dubeux Jr,&nbsp;Joao M. B. Vendramini,&nbsp;Hiran M. S. Silva,&nbsp;Esteban Rios,&nbsp;Luana M. D. Queiroz,&nbsp;Thomas P. Mawhinney","doi":"10.1111/gfs.12650","DOIUrl":"10.1111/gfs.12650","url":null,"abstract":"<p>The geographical distribution of bermudagrass cultivars is limited by freezing events (&lt;0°C), commonly associated with higher latitudes in the northern hemisphere. The lipid composition in the plant cell membranes is critical to promote persistence under freezing conditions. This study evaluated herbage accumulation (HA), nutritive value, and lipid biosynthesis of different bermudagrass cultivars in Ona, FL (27°26' N 82°55' W) and Marianna, FL (30^o52' N 85^o11' W), in 2 years. Treatments were five bermudagrass cultivars (Coastal, Tifton 44, Tifton 85, Jiggs, and Mislevy) distributed in a randomized complete block design with four replicates. HA was greater in Marianna than in Ona for all cultivars (<i>p</i> &lt; 0.05). Mislevy and Jiggs had greater HA in Marianna than the others (<i>p</i> &lt; 0.05), while all cultivars were similar in Ona (<i>p</i> &gt; 0.05). There was no difference between locations or among the cultivars for crude protein and neutral detergent fibre, but bermudagrass cultivars had greater in vitro digestibility of organic matter (IVDOM) in Marianna than in Ona (<i>p</i> &lt; 0.05). The concentration of unsaturated fatty acids increased in the northern latitude (Marianna; <i>p</i> &lt; 0.05). Coastal had greater unsaturated fatty acid concentration than other cultivars (<i>p</i> &lt; 0.05). Geographical location affects HA, IVDOM, and unsaturated fatty acid concentration of bermudagrass cultivars. The unsaturated fatty acid concentration plays a key role in acclimating bermudagrass to different thermal environments. Coastal showed great potential to tolerate chilling stress in Florida. Further studies may be developed to identify promising molecular markers for cold tolerance in bermudagrass.</p>","PeriodicalId":12767,"journal":{"name":"Grass and Forage Science","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Herbage and sheep production from simple, diverse, and legume pastures established in an agrivoltaic production system","authors":"Alyssa C. Andrew,&nbsp;Chad W. Higgins,&nbsp;Mary A. Smallman,&nbsp;David E. Prado-Tarango,&nbsp;Adolfo Rosati,&nbsp;Shayan Ghajar,&nbsp;Maggie Graham,&nbsp;Serkan Ates","doi":"10.1111/gfs.12653","DOIUrl":"10.1111/gfs.12653","url":null,"abstract":"<p>Agrivoltaic systems combine solar energy and agriculture, promoting dual land use. Although grazing sheep in these systems is common, research on intentionally designed pastures to increase production is lacking. This study seeks to compare the herbage growth and lamb production in simple, diverse, and legume pastures in an agrivoltaic system over 2 years in Oregon. Annual herbage production in diverse pastures (4583 kg DM ha⁻¹) was comparable to simple pastures (4457 kg DM ha⁻¹), but higher than legume pastures (<i>p</i> &lt; .05; 4023 kg DM ha⁻¹) for the 2020/2021 growing season. In the 2021/2022 growing season, diverse pastures had a higher yield (4660 kg DM ha⁻¹, <i>p</i> &lt; .05) than simple pastures (4052 kg DM ha⁻¹), which were similar to legume pastures (3955 kg DM ha⁻¹). Liveweight gain (LWG; g head⁻¹ d⁻¹) tended (<i>p</i> = .06) to be higher from lambs in diverse and legume pastures compared to simple pastures in spring 2021. Liveweight production (LWP; kg ha⁻¹ d⁻¹) of legume pasture were greater (<i>P</i> &lt; 0.05) than other pasture types, while simple pastures had the lowest LWP during this period. In summer 2021, LWG tended to be greater in lambs grazing diverse versus simple pastures. No difference was detected (all <i>p</i> &gt; .05) in LWG or LWP at any grazing period in 2022. Overall, efficiency of pasture production was greatly reduced by lower light availability in all pasture types. Diversification of pastures using forbs in agrivoltaics was a good strategy for greater herbage production, while the legume pastures had poor persistence.</p>","PeriodicalId":12767,"journal":{"name":"Grass and Forage Science","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Native forbs interseeded into native grass pastures persist under grazing","authors":"Jonathan D. Richwine,&nbsp;Patrick D. Keyser,&nbsp;John M. Zobel,&nbsp;Forbes R. Walker","doi":"10.1111/gfs.12651","DOIUrl":"10.1111/gfs.12651","url":null,"abstract":"<p>Incorporating native forbs within native warm-season grass (NWSG) pastures has the potential to benefit cattle, pollinators, and wildlife beyond that of NWSG monocultures. However, when grazing NWSG pastures, rotational stocking is recommended as opposed to continuous stocking. Therefore, to evaluate whether within-season rest is needed for native pasture sustainability, two NWSG grazing experiments were conducted near Greeneville, TN, 2017–2020, to assess the persistence of native forbs when an 11-species native forb blend was interseeded into established switchgrass (SG; <i>Panicum virgatum</i> L.) and big bluestem/indiangrass (BBIG; <i>Andropogon gerardii</i> Vitman and <i>Sorghastrum nutans</i> (L.) Nash) pastures. Each experiment was a completely randomized design with four replicates of each within-season rest grazing treatment (no rest, early rest, middle rest, late rest, and no graze). Within-season rest was not influential for NWSG tiller density or total forb plant density thus indicating persistence of forbs may not require rotational stocking. Purple prairie clover (<i>Dalea purpurea</i> Vent.) did not establish while Illinois bundleflower (<i>Desmanthus illinoensis</i> (Michx.) MacMill. ex B.L. Rob. &amp; Fernald) was only observed flowering once despite having the greatest seeding rate among forbs. Based on establishment and flowering of the 11 species in the current mixture, interseeding a 6-species polyculture of black-eyed Susan (<i>Rudbeckia hirta</i> L.), dixie ticktrefoil (<i>Desmodium tortuosum</i> (Sw.) DC.), eastern purple coneflower (<i>Echinacea purpurea</i> (L.) Moench), lanceleaf coreopsis (<i>Coreopsis lanceolata</i> L.), Maximilian sunflower (<i>Helianthus maximiliani</i> Schrad.), and oxeye sunflower (<i>Heliopsis helianthoides</i> (L.) Sweet) could allow for plant biodiversity while offering floral resources for pollinators during the NWSG grazing season.</p>","PeriodicalId":12767,"journal":{"name":"Grass and Forage Science","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Implementing plantain (Plantago lanceolata) to mitigate the impact of grazing ruminants on nitrogen losses to the environment: A review","authors":"J. B. Pinxterhuis,&nbsp;H. G. Judson,&nbsp;M. E. Peterson,&nbsp;S. Navarrete,&nbsp;E. Minnée,&nbsp;M. B. Dodd,&nbsp;S. R. Davis","doi":"10.1111/gfs.12649","DOIUrl":"10.1111/gfs.12649","url":null,"abstract":"<p>Urine patches from grazing ruminants contain high concentrations of nitrogen (N) and are the main source of N leaching from grazed pastoral farming systems. While there have been various options identified to substantially reduce N leaching, in general these practices increase the cost of production or reduce production per hectare. In New Zealand, multi-species pastures were evaluated as a cheaper option that would potentially retain productivity. Early research showed these pastures had lower urinary N excretion from grazing animals and increased plant N uptake, compared with standard New Zealand perennial ryegrass/white clover (PR-WC) pastures. Further research highlighted the beneficial attributes of the pasture herb narrow-leaved plantain (<i>Plantago lanceolata</i>; PL), specifically: reduced urine N concentration, reduced urine N excretion, and reduced rate of soil nitrification. Significant reductions (14%–89%) in N leaching were found from cow urine applied to lysimeters with pastures including PL, compared with PR-WC pasture. Paddock-scale measurements confirmed the effects of PL, with 20%–60% lower N leaching when PL comprised 30%–40% of the dry matter (DM) of PL-PR-WC grazed pastures. There were no negative effects on milk production and composition when feeding PL to dairy cows, but small positive effects on fatty acid profiles. However, weed and pest management, palatability and persistence remain challenging in pastures containing PL on commercial farms. Management options need to be clarified to ensure successful establishment and maintenance of PL. Additionally, the cultivar differences in secondary compounds and their impact on nitrification rate and N leaching need to be better understood.</p>","PeriodicalId":12767,"journal":{"name":"Grass and Forage Science","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/gfs.12649","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of oat (Avena sativa L.) populations for autumn sowing production in Southwest China","authors":"Yongjie Zhang,&nbsp;Shuchang Li,&nbsp;Xiaolong Dong,&nbsp;Qiuyu Mou,&nbsp;Jiajie Li,&nbsp;Xinyi Zhang,&nbsp;Min Lin,&nbsp;Kaiquan Yu,&nbsp;Pingping Zhou,&nbsp;Xiaobo Liu,&nbsp;Xiaoling Luo,&nbsp;Honghai Yan,&nbsp;Yuanying Peng","doi":"10.1111/gfs.12648","DOIUrl":"10.1111/gfs.12648","url":null,"abstract":"<p>Much of Chinese animal husbandry relies on the continuous availability of forage crops, but climactic constraints in production regions cause seasonal shortages which threaten the industry. This study compares the major characteristics of different forage oat lines and cultivars to evaluate their suitability for cultivation in the winter fallow fields of southwest China. To achieve this goal, six oat populations (2 cultivars and 4 lines) were sown in autumn in three locations in southwest China. Yield-related traits such as dry matter yield (DMY) and plant height (PH), as well as nutritional traits such as crude protein (CP), crude ash (ASH), neutral detergent fibre (NDF), acid detergent fibre (ADF), and relative feed value (RFV) were measured during two consecutive growing seasons. Our results indicate that all measured traits, with the exception of CP, were significantly influenced by environment, genotype, year and their interaction (<i>p &lt;</i> .05). Forage yield (DMY) had a positive correlation with PH and RFV, but a strong negative one with nutritional values, suggesting a trade-off between yield and quality. Among the six oat populations, ‘WC109’ consistently displayed the highest DMY, PH, and CP mean values as well as lower ASH, NDF, and ADF compared to all the other cultivars/lines. Based on these findings, ‘WC109’ was selected as the ideal candidate for autumn-sown forage oat in southwest China.</p>","PeriodicalId":12767,"journal":{"name":"Grass and Forage Science","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139458672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nitrogen rate and harvesting time based on growing degree days influenced winter cereal rye morphological traits, forage yield, quality, and farm profit in poorly drained Alfisols","authors":"Kelsey Vaughn,&nbsp;Oladapo Adeyemi,&nbsp;Omid R. Zandvakili,&nbsp;Martin L. Battaglia,&nbsp;Sirwan Babaei,&nbsp;Jayakrishnan Nair,&nbsp;Steven Still,&nbsp;Gabriella Burkett,&nbsp;Amir Sadeghpour","doi":"10.1111/gfs.12645","DOIUrl":"10.1111/gfs.12645","url":null,"abstract":"<p>Winter cereal rye (<i>Secale cereale</i> L.) (WCR) is often double cropped with maize for silage (<i>Zea mays</i> L.) to increase farm forage supply and profit. Spring nitrogen (N) fertilization to WCR could influence its production and quality at different harvesting times. Therefore, two on-farm trials were conducted in the 2019–2020 and 2020–2021 growing seasons to evaluate the effect of harvesting time (late-March to end-of-April considering the growth stage) and spring N fertilization (0, 23, 47, and 71 kg N ha⁻¹) on WCR morphology, forage yield, nutrient removal, quality, and farm profit. Only two N treatments (0 and 47 kg N ha⁻¹) were evaluated for each harvesting time in trial 1. A quadratic model best explained an increase in WCR dry matter (DM) yield in response to growing degree days (GDD) accumulation (<i>R</i>² = 0.81). An increase in GDD linearly decreased WCR relative forage quality (RFQ). Benchmarking RFQ at 150 for dairy milk production indicates WCR should be harvested at a GDD of 543, at which WCR plant height was 31.8 cm and DM yield was 0.77 Mg ha⁻¹. This resulted in loss of profit in both study years compared to later harvesting dates at higher GDDs. Benchmarking RFQ at 125 for heifer production indicated that harvest should occur at a GDD of 668, at which the WCR was 71 cm tall, and its DM yield was 2.25 Mg ha⁻¹. Nitrogen balances were negative at the N0 treatment (0 kg N ha⁻¹), indicating a need for some N to maximize WCR yield. We found that a rate between 21 and 47 kg N ha⁻¹ maximizes yields reflecting slightly positive balances, in which the highest profits occur. Our results suggest that the harvesting time can be predicted by GDD and should be adjusted for RFQ. We conclude that less than 47 kg N ha⁻¹ N fertilizer is required for WCR production in soils with manure history and high soil organic matter (&gt;30 g kg⁻¹).</p>","PeriodicalId":12767,"journal":{"name":"Grass and Forage Science","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139412897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of chop length of grass silage harvested at two maturity stages, and of concentrate protein level, on feed intake and milk production in dairy cows","authors":"Åshild T. Randby,&nbsp;Ingjerd Dønnem,&nbsp;Egil Prestløkken,&nbsp;Adam D. Martin,&nbsp;Arvid Steen,&nbsp;Margrete Eknæs","doi":"10.1111/gfs.12647","DOIUrl":"10.1111/gfs.12647","url":null,"abstract":"<p>This study in dairy cow feeding explored the effects of growth stage and chop length for grass-clover silage, and of concentrate protein level, including the interactions of these three factors. The experiment was conducted with 48 Norwegian Red cows according to a cyclic change-over design with four 4-week experimental periods and eight dietary treatments in a 2 × 2 × 2 factorial arrangement. Round bale silage from a mixed sward of timothy, meadow fescue, and red clover was harvested at two growth stages (H1, H2) and offered to dairy cows either unchopped with median particle length of 152 mm or chopped to 19 mm median particle length before feeding. A low protein (LP) concentrate containing 7% lignosulphonate treated soybean meal (SBM) and a high protein (HP) concentrate containing 12% solvent extracted SBM were compared. Silage was offered ad libitum and supplemented with 8 kg concentrate per day. Silage dry matter intake was 2.0 kg higher for H1 than H2 silage, which supported a higher yield of milk, energy-corrected milk and the milk constituents, fat, protein, and lactose. All these measures of milk production, as well as feed energy efficiency and N use efficiency, increased when silage was fed chopped rather than unchopped. Lignosulphonate treated SBM spared N in the diet without milk yield reductions. For efficient milk production with high energy and N utilisation, we recommend chopping to 20 mm for timothy, meadow fescue, and clover silages harvested in late stem elongation or in reproductive growth stages.</p>","PeriodicalId":12767,"journal":{"name":"Grass and Forage Science","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/gfs.12647","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139064050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of chromosome diversity of Elymus nutans on the Qinghai-Tibet plateau by FISH","authors":"Ruijuan Liu,&nbsp;Liling Jiang,&nbsp;Demei Liu,&nbsp;Jicheng Shen,&nbsp;Wenjie Chen","doi":"10.1111/gfs.12646","DOIUrl":"10.1111/gfs.12646","url":null,"abstract":"<p><i>Elymus nutans</i> Griseb. is an important herbage for forage and ecological restoration in the Qinghai-Tibet Plateau (QTP). It is widely distributed in different habitats of the QTP and has been reported to have high genetic diversity in protein, morphology and DNA sequence. The main objective of our investigation has been to obtain some knowledge of <i>E. nutans</i> chromosome genetic diversity. In this study, the TE probe S5 and tandem repeat probe AAG combined with sequential GISH were able to successfully distinguish different subgenomes and chromosomes in 7 <i>E. nutans</i> accessions from major global distribution sites. On this basis, a total of 123 individuals from four representative populations of <i>E. nutans</i> in the QTP were hybridised. The results of the experiment showed that four types of reciprocal translocations between subgenomes were observed in the four wild populations, and the translocation chromosomes, frequency, and heterozygosis were different in each population. The distribution and quantity of S5 and AAG signals also varied within and among the four populations. The results indicated that <i>E. nutans</i> had high genetic diversity at the chromosome level both within and among populations, and it was speculated that non-homologous recombination was one of the reasons for the high genetic diversity. These results provide important theoretical guidance for the collection, protection, and evaluation of <i>E. nutans</i>.</p>","PeriodicalId":12767,"journal":{"name":"Grass and Forage Science","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138948577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}