Effects of Ethylene and 2,4-Dichlorophenoxyacetic Acid on Cellular Expansion in Pisum sativum.
Effects of Ethylene and 2,4-Dichlorophenoxyacetic Acid on Cellular Expansion in Pisum sativum.
复制标题
乙烯和 2,4-二氯苯氧基乙酸对豌豆细胞扩张的影响。
DOI：
10.1104/pp.50.1.125
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发表时间：
1972
期刊：
影响因子：
7.4
通讯作者：
Stanley P. Burg
中科院分区：
文献类型：
--
作者：
A. Apelbaum;Stanley P. Burg
乙烯通过降低向组织供应生长素的极性生长素运输系统的能力来抑制完整黄化豌豆幼苗（Pisum sativum，var. Alaska）的下钩区域的生长。使用 0.1 mm 2,4-二氯苯氧基乙酸可逆转由乙烯引起的生长抑制，并刺激足够气体的形成，从而在不使用乙烯的情况下引发膨胀反应。当存在 0.1 毫米 2,4-二氯苯氧基乙酸时，添加的乙烯会引起进一步的膨胀反应，但生长速率没有变化。如果通过低压条件去除响应 0.1 毫米 2,4-二氯苯氧基乙酸而产生的乙烯，则可以防止组织肿胀，但生长速率不会改变。降低压力也不会影响对照植物的生长速度。较高浓度的 2,4-二氯苯氧基乙酸 (1 mm) 以类似的方式发挥作用，只不过它也通过直接除草作用抑制生长，而 0.1 mm 2,4-二氯苯氧基乙酸则刺激生长。施用乙烯和生长素诱导的乙烯可延长黄化幼苗和光生幼苗的细胞扩张阶段。只要存在乙烯，生长就会继续，葡萄糖会融入细胞壁，细胞壁重量与组织鲜重成比例增加。当乙烯被去除时，葡萄糖掺入细胞壁的量减少并且生长停止。
Ethylene inhibits growth in the subhook region of intact etiolated pea seedlings (Pisum sativum, var. Alaska) by reducing the capacity of the polar auxin transport system supplying auxin to the tissue. Application of 0.1 mm 2,4-dichlorophenoxyacetic acid reverses the growth inhibition caused by ethylene, and stimulates formation of sufficient gas to induce a swelling response in the absence of applied ethylene. Added ethylene causes a further swelling response but no change in growth rate when 0.1 mm 2,4-dichlorophenoxyacetic acid is present. If ethylene produced in response to 0.1 mm 2,4-dichlorophenoxyacetic acid is removed by hypobaric conditions, tissue swelling is prevented but the growth rate is not altered. Reducing the pressure also does not affect the growth rate of control plants. A higher concentration of 2,4-dichlorophenoxyacetic acid (1 mm) acts in a similar manner except that it also depresses growth through direct herbicidal action, whereas 0.1 mm 2,4-dichlorophenoxyacetic acid stimulates growth. Applied and auxin-induced ethylene prolong the phase of cellular expansion in both etiolated and light-grown seedlings. As long as ethylene is present, growth continues, glucose is incorporated into the cell wall, and the wall weight increases in proportion to tissue fresh weight. When ethylene is removed, glucose incorporation into the cell wall decreases and growth ceases.