营养物
穗
开枪
基因
光合作用
同化(音韵学)
生物
基因表达
转录因子
植物
维管束
化学
生物化学
生态学
语言学
哲学
作者
Masao Iwamoto,Tomoko Tsuchida‐Mayama,Hiroaki Ichikawa
摘要
Abstract In this study, we investigated the expression and functions of the transcription factor gene RDD4 ( rice Dof daily fluctuations 4 ), which has sequence similarity to RDD1 that controls nutrient ion accumulation in rice. RDD4 protein was highly accumulated in leaf sheaths and localized to vascular bundles. RDD4 ‐overexpressing plants ( RDD4 ‐OX) improved the accumulation of various nutrient ions, irrespective of nutrient concentration in a hydroponic solution. K + and Cl − deficiencies induced the accumulation of other cations and anions, respectively. Interestingly, in RDD4 ‐OX plants K + and Cl − deficiencies increased PO 4 3− and Mg 2+ contents, respectively, despite opposite electric charges. Furthermore, PO 4 3− deficiency induced NO 3 − and Mg 2+ accumulation in RDD4 ‐OX plants. These data show that RDD4 is associated with the control of nutrient ion contents within plants. Also, photosynthetic CO 2 assimilation in RDD4 ‐OX plants was higher than in wild‐type (WT) plants, although the sizes of shoots and panicles decreased in RDD4 ‐OX plants. Subsequent microarray analysis indicated that OsFWL7 , similar to maize CNR1 that negatively regulates plant size, showed the most significant difference in its expression levels between WT and RDD4 ‐OX plants. Based on these results, it is hypothesized that a prominent increase in the OsFWL7 expression reduces plant size in RDD4 ‐OX plants.
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