Rafael Marzall Amaral, Lesly Astrid Calva Sarango, C. E. R. Reis, Tulio Otávio Jardim D’almeida Lins, Ericka Beatriz Schultz, Daniel Carballo Guerrero
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引用次数: 0
摘要
潮湿热带地区的高降水量期和暂时性涝害对乌洛藻属的一些禾本科植物的生产和生存构成了挑战。本研究旨在通过产量和形态特征评估五种禾本科筇竹属植物在水涝条件下的耐受性。这些草[U. arrecta (Tanner), U. arrecta x U. mutica (Brachipará), U. brizantha cv. Marandú, U. hybrid cv. Cayman 和 U. humidloa]在水涝条件下的耐受性。Cayman 和 U. humidicola cv. Llanero]种植在花盆中,并在田间条件下保持 33 天;然后将其中一半置于(i)田间条件下(湿度保持 33%),另一半置于(ii)水涝条件下(水位高于土壤 2 厘米),持续 28 天。在这项研究中,坦纳草和布拉奇帕拉草在积水条件下表现出较高的干芽质量,其次分别是拉内罗草、开曼草和马兰杜草。Llanero、Tanner 和 Brachipará 的耐涝系数分别为 78.7、76.5 和 64.5,高于 Cayman 和 Marandú(分别为 41.0 和 23.1)。在水涝条件下,Brachipará、Tanner 和 Cayman 的根系体积较大,而 Marandú 的根系体积减少了 88.77%。与开曼和马兰杜基因型相比,坦纳、布拉克帕拉和拉内罗基因型更耐受排水不良或积水的土壤。
Comparison of the Waterlogging Tolerance and Morphological Responses of Five Urochloa spp. Grasses
Periods with high precipitation and temporary waterlogging in the humid tropics are challenging to the production and survival of some grasses of the genus Urochloa. This study aimed to evaluate the tolerance of five types of grass belonging to the genus Urochloa under waterlogging conditions through productive and morphological traits. The grasses [U. arrecta (Tanner), U. arrecta x U. mutica (Brachipará), U. brizantha cv. Marandú, U. hybrid cv. Cayman and U. humidicola cv. Llanero] were planted in pots and kept under field capacity for 33 days; then, half of them were submitted to (i) field capacity (33% humidity retention) and the other half were submitted to (ii) waterlogging conditions (2 cm of water above soil level) for 28 days. In this study, Tanner and Brachipará grasses showed higher dry shoot mass under waterlogging conditions, which were followed by Llanero, Cayman, and Marandú, respectively. Llanero, Tanner, and Brachipará presented higher waterlogging tolerance coefficients, 78.7, 76.5, and 64.5, respectively, being less affected than Cayman and Marandú (41.0 and 23.1, respectively). Brachipará, Tanner, and Cayman presented a higher root volume under waterlogging conditions, while Marandú root volume decreased by 88.77%. The Tanner, Brachipará, and Llanero genotypes were more tolerant to poorly drained or waterlogged soils than Cayman and Marandú genotypes.