ETHYLENE REGULATES THE TIMING OF LEAF SENESCENCE IN ARABIDOPSIS
ETHYLENE REGULATES THE TIMING OF LEAF SENESCENCE IN ARABIDOPSIS
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DOI：
10.1046/j.1365-313x.1995.8040595.x
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发表时间：
1995-10-01
期刊：
影响因子：
7.2
通讯作者：
BLEECKER, AB
中科院分区：
文献类型：
--
作者：
GRBIC, V;BLEECKER, AB
植物激素乙烯影响植物生长和发育的许多方面，包括一些特殊形式的程序性衰老，如果实成熟和花瓣衰老。以拟南芥乙烯不敏感突变体etr 1 -1为材料，研究乙烯与叶片衰老的关系。对etr 1 -1和野生型植物莲座叶衰老的比较分析表明，etr 1 -1的叶片比野生型叶片寿命长约30%。etr 1 -1叶片衰老延迟与衰老相关基因（SAGs）的延迟诱导和光合作用相关基因（PAG）的高表达水平相一致。在野生型植物中，外源乙烯能够进一步加速SAGs的诱导，并降低PAGs的表达。etr 1 -1叶片寿命延长与光合活性低有关。因此，etr 1 -1的叶片功能性衰老，即使叶片的表观寿命延长。
The plant hormone ethylene influences many aspects of plant growth and development, including some specialized forms of programmed senescence such as fruit ripening and flower petal senescence. To study the relationship between ethylene and leaf senescence, etr1-1, an ethylene-insensitive mutant in Arabidopsis, was used. Comparative analysis of rosette leaf senescence between etr1-1 and wild-type plants revealed that etr1-1 leaves live approximately 30% longer than the wild-type leaves. Delayed leaf senescence in etr1-1 coincided with delayed induction of senescence-associated genes (SAGs) and higher expression levels of photosynthesis-associated genes (PAGs). In wild-type plants, exogenous ethylene was able to further accelerate induction of SAGs and decrease expression of PAGs. The extended period of leaf longevity in etr1-1 was associated with low levels of photosynthetic activity. Therefore, the leaves in etr1-1 functionally senesced even though the apparent life span of the leaf was prolonged.