期刊
JOURNAL OF PLANT PHYSIOLOGY
卷 167, 期 1, 页码 47-53出版社
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2009.07.002
关键词
Cinnamic acid; Cowpea; Polyamines ratio; Ribulose-1,5-bisphosphate carboxylase; Spermine
资金
- National Key Technology RD Program [2006BAD171308]
- Youth Chenguang Project of Science and Technology of Wuhan City [200750731293]
- Science and Technology Project of Wuhan City [200820422171]
This study investigated the effects of cinnamic acid (CA) on ribulose-1,5-bisphosphate carboxylase (RuBPC) activity and the endogenous polyamine levels of cowpea leaves. The results show that 0.1 mM CA treatment decreased photosynthetic rate (P-n) and RuBPC activity, but it did not affect the maximal photochemical efficiency of PSII (F-v/F-m), the actual photochemical efficiency of PSII (phi PSII), intercellular CO2 concentration (C-i), and relative chlorophyll content. These suggest that the decrease in P-n is at least partially attributed to a lowered RuBPC activity. In addition, 0.1 mM CA treatment increased the putrescine (Put) level, but decreased spermidine (Spd) and spermine (Spm) levels, thereby reducing the (Spd+Spm)/Put (PAs) ratio in the leaves. The exogenous application of I mM Spd markedly reversed these CA-induced effects for polyamine and partially restored the PAs ratio and RuBPC activity in leaves. Methylglyoxal-bis (guanylhydrazone) (MGBG), which is an inhibitor of S-adenosylmethionine decarboxylase (SAMDC), results in the inability of activated cells to synthesize Spd and exacerbates the negative effects induced by CA. The exogenous application Of 1 MM D-arginine (D-Arg), which is an inhibitor of Put biosynthesis, decreased the levels of Put, but increased the PAs ratio and RuBPC activity in leaves. These results suggest that 0.1 mM CA inhibits RuBPC activity by decreasing the levels of endogenous free and perchloric acid soluble (PS) conjugated Spm, as well as the PAs ratio. Crown Copyright (C) 2009 Published by Elsevier GmbH. All rights reserved.
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