[Comparison of morphology, physiology and mineral element contents among genotypes of sesame with different tolerance to waterlogging under anaerobic condition].
The morphological and physiological indexes and the mineral element contents in different organs of 4 genotypes of sesame were examined under controlled oxygen supply. The number of adventitious roots of flooding tolerant varieties, Wild No. 7 and Yuzhi No. 1, increased 4-5 fold, the activity of ADH enhanced about twice, but the net photosynthetic rate (Pn) decreased slightly. There were significant increase in Ca and P and little decrease in K in roots, and decrease in other elements in roots and 8 elements in stems and leaves. As for less flooding-tolerant genotypes, Danbackaggce and Suiping Xiaozhihuang, however, the number of adventitious roots increased little, the activity of ADH enhanced 5-9 folds, and Pn decreased by 50-60%. An increase in Ca and P, and a significant reduction in K was found in roots. It was concluded that the waterlogging tolerance of sesame depended firstly on the structural adaptation, then on the anoxia metabolism, and that Ca and P may play an important role in the metabolic adaptation to the anaerobic environment for plant survival.
Wang
Wenquan
W
Department of Plant Nutrition, China Agricultural University, Beijing 100094. wquanw@hotmail.com
Zhang
Fusuo
F
Zheng
Yongzhan
Y
Mei
Hongxian
H
D000220:Adaptation, Biological / Q000502:physiology*; D000693:Anaerobiosis / Q000502:physiology*; D004190:Disasters; D005838:Genotype; D008903:Minerals / Q000378:metabolism*; D029601:Pedaliaceae / Q000378:metabolism / Q000502:physiology*; D010788:Photosynthesis
D008903:Minerals