Seed priming with glycinebetaine improves germination, yield, gas exchange and photosynthetic attributes in Sesamum indicum under saline stress

IF 0.7 4区 农林科学 Q3 AGRICULTURE, MULTIDISCIPLINARY
A. Tariq
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引用次数: 0

Abstract

Increased salinity stress in environment challenges the seed germination, emergence, and crop yield. The issue carefully demands the seed priming strategies to mitigate the drastic effects of salinity. Current study was conducted to appraise the modulation in germination, photosynthetic pigments, yield, and gas exchange attributes of sesame cultivars (TS-5 and TH-6) to pre-sowing seed treatment with glycinebetaine (GB) under salt stress. Seeds were treated with GB (25 mM) and water prior to sowing for 16 h. Ten seeds of each cultivar were laid down on moistened filter paper (0 mM and 70 mM NaCl) in petri plates to assess the germination attributes under salt stress. In a separate pot experiment, GB primed and water primed seeds were sown in 10 kg sand filled plastic pots. After two weeks of seed sowing, two concentrations of salinity (0 mM and 70 mM) were maintained by dissolving NaCl in full strength Hoagland nutrient solution. Data for germination, gas exchange and yield parameters were collected after one week, two week and ten weeks respectively. Salt stress decreased the germination percentage, plumule/radicle length, number of seeds/plant, Chl a, net photosynthetic rate (PN), stomatal conductance (gs) and transpiration rate (E), while intercellular CO2 concentration (Ci) and ratio of internal to atmospheric CO2 concentration Ci/Ca ratio were increased. However, seed mass/plant, Chl b and carotenoids remained unaffected under salinity. GB mitigated the saline effects by increasing the germination percentage, plumule length, number of seeds/plant and PN and showed nonsignificant effect on radicle length, seed mass per plant and Chl a, b and carotenoid contents. Sesame cultivar TH-6 showed better performance as compared to TS-5 under saline conditions. GB is powerful osmoregulator to minimize salt effect in sesame by enhancing physiological and yield attributes
大豆甜菜碱对盐胁迫下芝麻种子萌发、产量、气体交换和光合特性的影响
环境中盐度胁迫的增加对种子的发芽、出苗和作物产量提出了挑战。这个问题谨慎地要求种子启动策略来减轻盐度的剧烈影响。本研究旨在评价盐胁迫下大豆甜菜碱(GB)对芝麻品种(TS-5和TH-6)种子发芽、光合色素、产量和气体交换特性的调节作用。种子在播种前用GB(25mM)和水处理16小时。将每个品种的10个种子放在培养皿中的湿润滤纸(0mM和70mM NaCl)上,以评估盐胁迫下的发芽特性。在另一个盆栽实验中,将GB引发的和水引发的种子播种在10公斤装沙子的塑料盆中。种子播种两周后,通过将NaCl溶解在全浓度Hoagland营养液中来维持两种浓度的盐度(0mM和70mM)。分别在一周、两周和十周后收集发芽、气体交换和产量参数的数据。盐胁迫降低了发芽率、胚芽/根长、种子/株数、叶绿素a、净光合速率(PN)、气孔导度(gs)和蒸腾速率(E),而细胞间CO2浓度(Ci)和内部与大气CO2浓度之比Ci/Ca增加。然而,种子质量/植株、叶绿素b和类胡萝卜素在盐度下不受影响。GB通过增加发芽率、胚芽长度、每株种子数和PN来减轻盐水效应,对胚根长度、单株种子质量、叶绿素a、b和类胡萝卜素含量无显著影响。芝麻品种TH-6在生理盐水条件下表现出比TS-5更好的性能。GB是一种强大的渗透调节剂,通过增强生理和产量特性,最大限度地减少芝麻中的盐效应
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来源期刊
Pakistan Journal of Agricultural Sciences
Pakistan Journal of Agricultural Sciences AGRICULTURE, MULTIDISCIPLINARY-
CiteScore
1.80
自引率
25.00%
发文量
18
审稿时长
6-12 weeks
期刊介绍: Pakistan Journal of Agricultural Sciences is published in English four times a year. The journal publishes original articles on all aspects of agriculture and allied fields.
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