AERENCHYMA (GAS-SPACE) FORMATION IN ADVENTITIOUS ROOTS OF RICE (ORYZA-SATIVA-L) IS NOT CONTROLLED BY ETHYLENE OR SMALL PARTIAL PRESSURES OF OXYGEN
AERENCHYMA (GAS-SPACE) FORMATION IN ADVENTITIOUS ROOTS OF RICE (ORYZA-SATIVA-L) IS NOT CONTROLLED BY ETHYLENE OR SMALL PARTIAL PRESSURES OF OXYGEN
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DOI：
10.1093/jxb/36.10.1566
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发表时间：
1985-01-01
影响因子：
6.9
通讯作者：
JENKINS, W
中科院分区：
文献类型：
--
作者：
JACKSON, MB;FENNING, TM;JENKINS, W
用显微镜观察了水稻营养体不定根皮层内的气孔（通气组织）的大小。气体空间检测1天的年龄组织和增加的程度随着年龄的增长。7 d后，约70%的皮层退化形成通气组织。在1-4-D-老组织的空隙的程度并没有增加的停滞，通风不良的外部环境，其特征是低于环境的氧分压和二氧化碳和乙烯的积累。处理与小的氧分压，或与二氧化碳或乙烯施加在剧烈搅拌的营养液也未能促进皮层气体空间的形成。此外，乙烯生产水稻根系减缓了典型的停滞条件下的小氧分压。银银，乙烯作用的抑制剂，并没有阻碍气体空间的形成;同样，当内源性乙烯的产生被抑制的应用aminoethoxylvinylglycine（AVG），通气组织的发展继续有增无减。氯化钴，另一个假定的乙烯生物合成的抑制剂，并没有损害水稻根中气体的形成，也没有减少通气组织的程度，即使同时供应AVG。这些结果与先前使用玉米根获得的结果形成对比。我们的结论是，在水稻中，通气组织的形式迅速，即使在良好的通气环境中作为一个组成部分，普通的根发展。似乎很少或根本不需要乙烯作为刺激，在停滞的根环境中，通气组织可能会增加生存的可能性。
The extent of gas-filled voids (aerenchyma) within the cortex of adventitious roots of vegetative rice plants was estimated microscopically from transverse sections with the aid of a computer-linked digitizer drawing board. Gas-space was detectable in 1-d-old tissue and increased in extent with age. After 7 d, approximately 70% of the cortex had degenerated to form aerenchyma. The extent of the voids in 1-4-d-old tissue was not increased by stagnant, poorly-aerated external environments characterized by sub-ambient oxygen partial pressures and accumulations of carbon dioxide and ethylene. Treatment with small oxygen partial pressures, or with carbon dioxide or ethylene applied in vigorously stirred nutrient solution also failed to promote the formation of cortical gas-space. Furthermore, ethylene production by rice roots was slowed by small oxygen partial pressures typical of stagnant conditions. Silver nitrate, an inhibitor of ethylene action, did not retard gas-space formation; similarly when endogenous ethylene production was inhibited by the application of aminoethoxyvinylglycine (AVG), aerenchyma development continued unabated. Cobalt chloride, another presumed inhibitor of ethylene biosynthesis, did not impair formation of the gas in rice roots nor did it decrease the extent of aerenchyma even if AVG was supplied simultaneously. These results contrast with those obtained earlier using roots of Zea mays L. We conclude that in rice, aerenchyma forms speedily even in well-aerated environments as an integral part of ordinary root development. There seems to be little or no requirement for ethylene as a stimulus in stagnant root-environments where aerenchyma is likely to increase the probability of survival.