Abscisic Acid-induced Leaf Senescence of Rice Seedlings is Due to Hydrogen Peroxide Accumulation

脫落酸所誘導水稻幼苗葉片老化係經由過氧化氫累積造成

許奕婷(Yi-Ting Hsu) ； 高景輝(Ching-Huei Kao)

《作物、環境與生物資訊》 7卷4期 (2010/12) Pp. 243-249

https://doi.org/10.30061/CEB.201012.0003

摘要

本研究主要探討脫落酸所誘導之水稻幼苗葉片老化是否由於過氧化氫累積所造成。脫落酸處理可促進臺中在來1號幼苗葉片之老化，但不會導致臺農67號幼苗葉片之老化。脫落酸處理使得臺農67號葉片之脫落酸含量大於臺中在來1號所增加脫落酸之量。就老化而言，臺中在來1號是對脫落酸敏感之品種，而臺農67號則是對脫落酸不敏感之品種。脫落酸處理可使臺中在來1號幼苗葉片累積過氧化氫，但不會使臺農67號幼苗葉片過氧化氫含量累積。再者，脫落酸處理造成臺中在來1號葉片內過氧化氫含量之增加早於老化現象之發生。

關鍵字

脫落酸 ； 過氧化氫 ； 葉片老化 ； 水稻

並列摘要

The role of H2O2 in abscisic acid (ABA)-induced senescence of leaves attached to rice seedlings has been investigated. ABA treatment resulted in leaf senescence promotion of cultivar Taichung Native 1 (TN1) seedlings, but not cultivar Tainung 67 (TNG67). Results also show that the increase in ABA content in the leaves of ABA-treated TN1 seedlings is less pronounced than that of ABA-treated TNG67. In term of leaf senescence, it appears that rice seedlings of cultivar TN1 are ABA-sensitive and those of cultivar TNG67 are ABA-insensitive. On treatment with ABA, H2O2 accumulated in the leaves of TN1 seedlings but not in the leaves of TNG67. Evidence was provided to show that ABA-increased H2O2 content in the leaves of TN1 seedlings was prior to the occurrence of senescence.

並列關鍵字

Abscisic acid ； H2O2 ； Leaf senescence ； Oryza satvia