Leaf water retention of excised leaves as a measure of drought resistance in grain sorghum (Sorghum bicolor L. Moench) genotypes

W. Wenzel, W. J. Berg
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引用次数: 2

Abstract

The objective of these experiments was to evaluate the usefulness of the excised leaf water retention capability (ELWRC) technique for screening grain sorghum genotypes for drought resistance. Seven genotypes were planted in a randomized block consisting of four replications. The plants were kept under severe moisture stress. In addition to their ELWRC, the canopy temperature, diffusive resistance, transpiration and yield potential was measured. Significant differences between genotypic means were obtained for ELWRC and yield potential only. These were significantly correlated (r = 0,89). Correlations between the other characteristics are discussed. Only additive genetic variation was detected for ELWRC in a partial diallei of three female and nine male inbred lines. It was concluded that ELWRC was a satisfactory screening technique for drought resistance of the sorghum genotypes included in these experiments.
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高粱(sorghum bicolor L. Moench)基因型残叶保水性的测定
本试验旨在评价残叶保水性(ELWRC)技术在高粱抗旱基因型筛选中的应用价值。7个基因型种植在一个随机区,由4个重复组成。这些植物受到严重的水分胁迫。除ELWRC外,还测量了冠层温度、扩散阻力、蒸腾和产量势。仅在ELWRC和产量潜力的基因型平均值之间存在显著差异。这些显著相关(r = 0.89)。讨论了其他特性之间的相关性。在3个雌性自交系和9个雄性自交系的部分双列中,仅检测到ELWRC的加性遗传变异。结果表明,ELWRC是一种较为理想的高粱抗旱性筛选技术。
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