Aluminium long-term stress differently affects photosynthesis in rye genotypes

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• 作者：S&oacute ; nia Silva^a ; Gl&oacute ; ria Pinto^a ; Maria Celeste Dias^a ; Carlos Manuel Correia^b ; Jos&eacute ; Moutinho-Pereira^b ; Olinda Pinto-Carnide^c ; Conceiç ; &atilde ; o Santos^a ; ^{csantos@ua.pt}
• 关键词：Aluminum ; Secale cereale ; Rye ; Long-term exposure ; Photosynthesis ; Calvin cycle
• 刊名：Plant Physiology and Biochemistry
• 出版年：2012
• 期刊代码：87_09819428
• 类别：abs
• 出版时间：May, 2012
• 卷：54
• 期：Complete
• 页码：105-112
• 文件大小：472 K

摘要

The ability of crops to overcome Al toxicity varies among crop species and cultivars. Among the Triticeae genus, rye (Secale cereale) is considered the most Al-tolerant species. In the present work, two rye genotypes differing in Al tolerance (鈥楻iodeva鈥? Al-sensitive and 鈥楧onkowsky Zlote鈥? Al-tolerant) were exposed to 1.11 and 1.85聽mM Al during three weeks. Growth, water status and photosynthesis related parameters were assessed. After three weeks of Al exposure, both genotypes presented similar decrease in leaf growth. Al-induced RWC decreased in both genotypes, but was more remarkable in 鈥楻iodeva鈥? Al toxicity induced a decrease in net photosynthetic rate only after three weeks of exposure. In 鈥楧. Zlote鈥? A decrease was accompanied by stomatal closure, Chl a content and q_p reduction, but no alterations in RuBisCo or sFBPase activity were observed. In 鈥楻iodeva鈥?plants exposed to 1.11聽mM Al, A decrease was accompanied by C_i/C_a increase whereas in plants exposed to 1.85聽mM Al C_i/C_a was not affected. Nevertheless, for both conditions RuBisCo activity decreased. A decrease did not limited glucose accumulation in neither of the rye genotypes. This study revealed that Al-induced earlier damages in the 鈥楻iodeva鈥?genotype, but both genotypes showed long-term high susceptibility to Al. Furthermore, the photosynthetic parameters proved to be a good tool to monitor Al-sensitivity and long-term exposure showed to be crucial to evaluate Al-sensitivity.