Seminal,adventitious and lateral root growth and physiological responses in rice to upland conditions |
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| Authors: | Yang Ling Zheng Bing-song Mao Chuan-zao Yi Ke-ke Wu Yun-rong Wu Ping Tao Qin-nan |
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| Institution: | (1) College of Life Sciences, Zhejiang University, 310029 Hangzhou, China |
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| Abstract: | Understanding the growth and physiological responses of rice to upland conditions would be helpful for designing treatments
to improve the tolerance of rice under a rainfed system. The objective of this study was to investigate the initiation, elongation
and membrane stability of seminal, lateral and adventitious roots of upland rice after 9-d upland condition treatment. Compared
with control roots under waterlogged conditions, upland water deficiency conditions favor seminal and lateral root growth
over adventitious root growth by accelerating seminal root elongation, promoting lateral root initiation and elongation, and
reducing the elongation and number of adventitious roots. Enhanced total root number and length resulted in increase of total
root dry weight and thereby increasing the root-to-shoot ratio. Organic compound leakage from seminal root tips and adventitious
roots increased progressively to some extent with upland culture duration, while significant increases in semial root tips
were the consequence of loss of membrane integrity caused by the upland-condition enhanced growth.
Project (No. G1999011700) supported by National Key Basic Research Special (863) Foundation of China |
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| Keywords: | Oryza sativa L Root growth Upland conditions |
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