摘要
26个大豆基因型和 18个小麦基因型的叶片和种子的稳定碳同位素分馏值 (△ 13C)在正常供水和缺水的田间条件下皆有明显的基因型差别。土壤干旱降低△ 13C值 ,提高水分利用效率 ( WUE)并增大了不同基因型间的差值。抗旱性不同的基因型的叶片和种子的△ 13C平均值及相应的 WUE与抗旱性大小之间表现一定的规律性变化 ,抗旱性强的基因型的△ 13C比抗旱性中等和差者较低而相应的 WUE较高。叶片的△ 13C的基因型差异大于种子。结果表明 ,△ 13C受作物基因型控制和环境条件互作的影响 ,利用△ 13C评估和选育高 WUE种质应作干旱试验并计算△ 13C和 WUE的干
Significant differences of carbon isotope discrimination( △ 13 C ) in leaves and seeds among 26 genotypes of soybean and 18 genotypes of wheat with varying drought resistance were observed both under wet or dry field soil condition. Water stress reduced the △ 13 C value associated with the increases in water use efficiency (WUE) and the difference among genotypes. The mean values of △ 13 C in leaves of soybean and wheat were 17.64‰ and 18.14‰ at wet condition, but 16.78‰ and 17.08‰ at dry condition, respectively. Genotypes with high drought tolerance in soybean and wheat showed a lower △ 13 C and high WUE than that with middle and low drought tolerances. More genotypic differences of △ 13 C were found in leaves than in seeds. The results indicated that △ 13 C was dependent on the interaction between genotypes control and environments. It is proposed that estimation and selection for high WUE genotype by △ 13 C should be tested under dry condition and calculated the ratio of dry/wet in △ 13 C and WUE.
出处
《作物学报》
CAS
CSCD
北大核心
2001年第4期409-414,共6页
Acta Agronomica Sinica
基金
中国科学院特别支持项目 KZ95 7- 0 2资助
