FRUIT AGE AND CHANGES IN ABSCISIC-ACID CONTENT, ETHYLENE PRODUCTION, AND ABSCISSION RATE OF COTTON FRUITS
FRUIT AGE AND CHANGES IN ABSCISIC-ACID CONTENT, ETHYLENE PRODUCTION, AND ABSCISSION RATE OF COTTON FRUITS
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DOI：
10.1104/pp.69.2.349
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发表时间：
1982-01-01
期刊：
影响因子：
7.4
通讯作者：
GUINN, G
中科院分区：
文献类型：
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作者：
GUINN, G
研究了棉花果实成熟期与脱落酸（阿坝）浓度、乙烯释放量及乙烯释放速率的关系。多毛草属，CV. Deltapine果实很少在开花后15天以上开花。由于限制光合作用的条件会增加棉花果实的脱落，因此将具有不同年龄果实的温室生长植物置于昏暗的光下3天以诱导高的果实脱落率。测定了不同果龄果实的脱落率、阿坝浓度和乙烯释放速率。几乎所有的幼果都脱落，但脱落率随着年龄的增长而下降，直到开花后15天或更长时间的果实几乎没有脱落。弱光处理提高了6-11天果实的阿坝含量，但不提高较年轻或较老果实的阿坝含量。阿坝含量随果龄的增加而下降，在花后4和6天达到峰值。弱光也促进了10日龄以下果实的乙烯释放，但对11日龄以上果实的乙烯释放影响不大。乙烯释放量随果龄的增加而下降，峰值出现在花后4天和6天。将不同年龄的果实（来自未暴露于昏暗光的植物）切片以诱导伤口乙烯产生的高速率。显然，乙烯产生的能力随着果龄而下降，与乙烯释放速率的下降平行。阿坝浓度和乙烯释放随果龄的降低表明，合成这些激素的能力的变化，特别是对胁迫的反应，是棉花果实变老时脱落率下降的原因之一。
The relationships of fruit age, abscisic acid (ABA) concentration, ethylene evolution and abscission rates were studied to determine why cotton (G. hirsutum L., cv. Deltapine 16) fruits rarely abscise more than 15 days after anthesis. Because abscission of cotton fruits is increased by conditions that limit photosynthesis, greenhouse-grown plants with fruits of various ages were placed in dim light for 3 days to induce high rates of fruit abscission. Abscission rates, ABA concentrations and ethylene evolution rates were determined for fruits of various ages. Almost all of the young fruits abscised, but abscission rate declined with age until almost no abscission occurred in fruits that were 15 or more days past anthesis. Dim light increased the ABA concentrations of fruits that were 6-11 days old but did not increase ABA concentrations in fruits that were younger or older. The concentration of ABA declined with fruit age from peak values at 4 and 6 days after anthesis. Dim light also increased ethylene evolution from fruits up to 10 days old but had little effect on ethylene production or abscission of fruits > 11 days old. Ethylene evolution declined with fruit age from peak values at 4 and 6 days after anthesis. Fruits of various ages (from plants not exposed to dim light) were sliced to induce high rates of wound ethylene production. Apparently, the capacity for ethylene production declined with fruit age, parallel with a decline in abscission rate. Decreases in ABA concentration and ethylene evolution with fruit age indicate that change in the capacity to synthesize these hormones, especially in response to stress, is 1 cause of the decline in abscission rates as cotton fruits become older.