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首页> 美国卫生研究院文献>Plant Physiology >Developing Seeds of Ricinus communis L. When Detached and Maintained in an Atmosphere of High Relative Humidity Switch to a Germinative Mode without the Requirement for Complete Desiccation
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Developing Seeds of Ricinus communis L. When Detached and Maintained in an Atmosphere of High Relative Humidity Switch to a Germinative Mode without the Requirement for Complete Desiccation

机译：分离并保持在较高相对湿度的环境下正在生长的蓖麻种子正在转变为发芽模式而无需完全干燥

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Immature seeds of castor bean (Ricinus communis) removed from the capsule at 25 to 40 days after pollination (25-40 DAP) and placed in an atmosphere of high relative humidity undergo limited water loss, and germinate upon subsequent return to full hydration. This switch from a developmental to a germinative/growth mode at 40 DAP is reflected in a change in the types of proteins being synthesized in the endosperm; after partial drying, developmental protein synthesis ceases and germinative/growth-related proteins are produced. The nature and timing of these protein synthetic changes elicited upon imbibition are identical to those following premature desiccation/rehydration of 30 and 40 DAP seeds and upon imbibition of the mature dry seed. Enzymes involved in postgerminative reserve mobilization (l-leucyl-β-naphthylamidase and isocitrate lyase) are induced upon imbibition, following partial drying at 40 DAP, to levels attained in the endosperms of germinated mature, and prematurely dried/rehydrated, seeds. The changes in protein synthesis resulting from partial drying are effected at the transcriptional and post-transcriptional level. Upon return to full hydration some new (i.e. germination and growth-related) mRNAs are synthesized, while others (associated with development) present in the partially dried endosperm decline. Thus developing seeds of castor bean do not have to experience substantial (whole seed) water loss to acquire the ability to germinate and grow upon subsequent imbibition. Seed detachment from the mother plant alone is not sufficient to elicit a switch to germination and growth processes. However, the length of time of detachment from the mother plant, in combination with some water loss may interact to elicit the “switch” from development to germination.
机译：在授粉（25-40 DAP）后的25到40天时，将未成熟的蓖麻籽（Ricinus communis）从胶囊中移出并置于相对湿度高的环境中，水分损失有限，并在随后恢复完全水合作用时发芽。在40 DAP时，从发育模式向发芽/生长模式的转变反映在胚乳中合成蛋白质类型的变化中。部分干燥后，发育中的蛋白质合成停止，并产生与发芽/生长相关的蛋白质。吸水引起的这些蛋白质合成变化的性质和时间与30和40 DAP种子过早脱水/复水以及吸干成熟干种子后的性质和时间相同。吸收后，在40 DAP下部分干燥后，吸收后诱导参与萌发后动员的酶（1-亮氨酰-β-萘酰胺酶和异柠檬酸裂合酶）达到发芽的成熟和过早干燥/复水的种子的胚乳中达到的水平。部分干燥导致的蛋白质合成变化在转录和转录后水平上受到影响。恢复到完全水合后，会合成一些新的（即与发芽和生长相关的）mRNA，而部分干燥的胚乳中的其他mRNA（与发育相关）会下降。因此，蓖麻子的发育中的种子不必经历大量的（整个种子）失水即可在随后的吸收过程中获得发芽和生长的能力。仅从母体植物脱离种子不足以引发转向发芽和生长过程。但是，从母体上脱离的时间长度以及一些水分流失可能相互作用，从而引发从发育到发芽的“转变”。

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