权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Mechanisms of Response of Plant Cell Walls to Temperature Signal

植物细胞壁对温度信号的响应机制

基本信息

批准号：
11640654
负责人：
HOSONI Takayuki
金额：
$ 2.24万
依托单位：
Osaka City University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640654/
关键词：
Cell wall Cell wall extensibility Temperature Environmental signal Rice coleoptile Azuki bean epicotyl (1 → 3), (1 → 4)-β-glucan Xyloglucan シキログルカン分解酵素成長調節 (1→3),(1→4)一β-グルカングルカナーゼ浸透圧

项目摘要

Rice (Oryza sativa L. cv. Koshihikari) and azuki bean (Vigna angularis Ohwi et Ohashi cv. Takara) seedlings were grown under various temperature conditions and the mechanism inducing the difference in growth rate was analyzed. When both seedlings which had been grown in the dark at 30℃ were transferred to the temperature range of 10-50℃ and grown further, the growth rate of rice coleoptiles and azuki bean epicotyls was maximum at 40℃ and 30℃, respectively. The cell wall extensibility was also the highest at such temperatures, and became smaller as the temperature increased or decreased. There were close correlations between the growth rate and the extensibility of both materials. On the other hand, the cellular osmotic concentration of rice coleoptiles and azuki bean epicotyls was lower at the temperatures where the growth rate was high. These results suggest that the growth rate of plant shoots is mainly determined by the mechanical properties of the cell wall in the moderate, physiol … More ogical temperature range.In rice coleoptiles, the levels of cell wall polysaccharides per unit length were the highest, whereas the molecular mass of the hemicellulosic polysaccharides was the lowest at 40℃. The activity of (1→3), (1→4) -β-D-glucan degradation was the highest at 40℃, and decreased as the temperature increased or decreased from this temperature range. These data suggest that in rice coleoptiles temperature regulates the cell wall extensibility mainly by affecting the activity of (1→3), (1→4) -β-glucan degradation. On the other hand, in azuki bean epicotyls, there were no clear changes in the levels of cell wall polysaccharides per unit length of epicotyls, or the molecular masses of the pectin or the HC-I polysaccharides, irrespective of temperature. However, the molecular mass of the HC-II polysaccharides was the lowest at 30℃. Xyloglucan-degrading activity in azuki bean epicotyls was highest at 30℃, and decreased as the temperature increased or decreased from this temperature range. Thus, in azuki bean epicotyls temperature in the moderate, physiological range was shown to regulate the cell wall extensibility mainly by affecting the activity of xyloglucan degradation. Less

水稻（Oryza sativa L.）CV. Koshihikari）和红豆（Vigna angularis Ohwi et Ohashi cv.在不同的温度条件下生长，并分析了导致生长速率差异的机理。将30℃黑暗条件下培养的水稻幼苗转移到10-50℃继续培养，水稻胚芽鞘和红豆上胚轴的生长速率分别在40℃和30℃时达到最大。细胞壁的延伸性也在此温度下最高，并随着温度的升高或降低而变小。两种材料的生长速率与延伸率之间存在密切的相关性。另一方面，水稻胚芽鞘和红豆上胚轴的细胞渗透浓度在生长速度快的温度下较低。这些结果表明，在中等生理条件下，植物新梢的生长速度主要取决于细胞壁的力学性质， ...更多信息在40℃时，水稻胚芽鞘单位长度细胞壁多糖含量最高，半纤维素多糖分子量最低。（1→3），（1→4）-β-D-葡聚糖降解活性在40℃时最高，在此温度范围内随温度升高或降低而降低。这些结果表明，温度主要通过影响（1→3），（1→4）-β-葡聚糖降解活性来调节水稻胚芽鞘细胞壁的伸展性。另一方面，在红豆上胚轴中，无论温度如何，每单位长度上胚轴的细胞壁多糖水平或果胶或HC-I多糖的分子量都没有明显变化。而在30℃时，HC-II多糖的相对分子质量最低。小豆上胚轴的木葡聚糖降解活性在30℃时最高，在此温度范围内随着温度的升高或降低而降低。因此，在红豆上胚轴中，在适度的生理温度范围内，主要通过影响木葡聚糖降解活性来调节细胞壁的伸展性。少