|Table of Contents|

Effect of Ethylene on Morphology and Physiological Characteristic of Soybean Seedlings under Low-Phosphorus Stress(PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

Issue:
2012年01期
Page:
58-63
Research Field:
Publishing date:

Info

Title:
Effect of Ethylene on Morphology and Physiological Characteristic of Soybean Seedlings under Low-Phosphorus Stress
Author(s):
GAO Bin; CAO Cui-ling; LI Tao
College of Life Sciences，Northwest A & F University，Yangling 712100，Shaanxi，China
Keywords:
Phosphorous deficiency; Ethylene; CoCl2; Soybean; Acid phosphatase
PACS:
S565.1
DOI:
10.3969/j.issn.1000-9841.2012.01.013
Abstract:
Plants grown in phosphorus-deficient solutions often exhibit up-regulation of root secreted acid phosphatase activity and enhanced ethylene production.To determine the role of ethylene in response of plants to P deficiency，we investigated the effects of ethylene donor ethephon and ethylene synthesis antagonists(CoCl2)on P concentrations in roots of soybean seedlings grown in P-sufficient(1 mmol·L-1 H2PO4)and P-deficient(10 μmol·L-1 H2PO4)solution.There was an increase in ethylene production when seedlings grown in P-deficient solutions，CoCl2 abolished the P deficiency-induced ethylene production.The main root length under the low phosphorus application treatment was about 50% lower than that of the control，and the main root length of soybean seedlings grown in P-sufficient solutions was insensitive to Co2+，while Co2+enhanced main root length for those grown in P-deficient solutions，suggesting that P-deficiency induced decrease in root length can be reversed by inhibiting ethylene production.Under P-deficient conditions the lateral root number increased by 64%，and the longest lateral root increased by 46% compared with the control.The lower root length and higher lateral root number induced by ethylene were reversed by Co2+.There was an increase in root activity and acid phosphatase(APase)activity when seedlings grown in P-deficient solutions，and the increase in root activity and APase activity were markedly induced by ethylene.Phosphorus deficiency affects the shoot dry mass accumulation and almost has no effects on accumulation of root dry mass.The root/shoot ratio was enhanced by ethylene.Ethylene promoted P concentration of P-deficient seedlings. Results suggest that ethylene induced by P deficiency may play an important role in P-stress adaption of soybean.

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Last Update: 2014-08-15