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Accueil du site → Master → Etats Unis → 1987 → Comparison of screening techniques for traits relating to drought tolerance in grain sorghum

Kansas State University (1987)

Comparison of screening techniques for traits relating to drought tolerance in grain sorghum

Majerus, William Joseph

Titre : Comparison of screening techniques for traits relating to drought tolerance in grain sorghum

Auteur : Majerus, William Joseph.

Université de soutenance : Kansas State University

Grade : Master of Science (MS) 1987

Résumé
Although several screening techniques involving various physiological and morphological traits have proven effective, implementing these screening methods in a breeding program have been hypothesized to be both labor and time intensive. In this study the objectives were to compare certain physiological and/or morphological measurements taken prior to anthesis on the bases of their ability to discriminate between genotypes under stress and their inheritance. Eight sorghum ( Sorghu m bicolor (L.) Moench) parent lines, ranging from susceptible to tolerant in reaction to water stress, were mated in a 3 line x 5 tester factorial design. The eight parents, 15 F]^’s,and 5 commercial checks were tested in a randomized complete block design with a split-plot arrangement under 2 water treatments. Stomatal conductance, leaf temperature, transpirational rate, leaf water potential, and cellular membrane strength were measured during weekly intervals from approximately 40 days after planting until anthesis. Significant entry mean differences were found for leaf water potential and cellular membrane strength just prior to flag leaf stage of development. No significant parent vs progeny correlations, GCA or SCA effects and heterosis were found for these two plant traits. Both traits were significantly correlated with senescence at this pre-anthesis stage.

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