Soybean [Glycine max. (L.) Merr.] resistance to heat stress at seedling stage
DOI:
https://doi.org/10.47808/revistabioagro.v4i1.45Keywords:
Glycine max L. (Merr.), heat resistance, abiotic stress, thermotoleranceAbstract
The aim of this study was to determine the response of 21 soybean genotypes at seedling stage to high temperatures. Four temperature levels were evaluated: θ1 = 50 ± 1 °C, θ2 = 54 ± 1 °C, θ3 = 58 ± 1 °C, and θ4 = 62 ± 1 °C, which were cumulative. Closure degree of leaves (GCH) for θ1 and wilting degree (GM) for the rest of treatments were scored. After last treatment, irrigation was applied and recovery degree (GR) of stressed seedling was observed. Experimental design was completely random unbalanced for GCH and GR; for GM was completely randomized in factorial 21 x 3 arrangement. Differences in GCH were observed between genotypes: six were insensitive, while H98-1240 closed its leaves completely. Regarding generic effects, θ4 caused the largest GM and between genotypes, 15 have a low GM, H02-1337 excelled as the less wilted; H98-1240 was the most affected. According to specific effects, H02-1337 unchanged GM from θ2 to θ3, considered a resistant genotype at this level; while H02-2248 increased GM to a lesser extent between θ3 and θ4. The GR after irrigation indicated that the most GM genotypes took longer to recover, even some ones not recovered, and vice versa; however this variability it was due to random effects probably.
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Copyright (c) 2016 Julio C García Rodríguez, Abel Muñoz Orozco, Nicólas Maldonado Moreno, Serafín Cruz Izquierdo, Guillermo Ascencio Luciano
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