高温胁迫下半夏倒苗前后内源激素的变化

目的：探讨在高温胁迫下半夏倒苗前后内源激素含量的变化,从而为延缓半夏倒苗提供信息。方法：在半夏植株高15 cm左右时,给予(30±1) ℃的高温胁迫,于不同的胁迫处理天数分别测定半夏叶片、叶柄和块茎中内源激素(ABA,JA,GA₃,ZR,IAA)的含量。结果：随着高温胁迫时间的延长,半夏叶片、叶柄、块茎中ABA和JA的含量明显增加。半夏叶片、叶柄中IAA的含量明显降低,而块茎中IAA的含量降低却不明显。高温胁迫后,ZR的含量逐渐下降。半夏叶片中GA₃含量明显上升,但是叶柄、块茎中GA₃含量却下降。结论：在高温胁迫下,内源激素ABA,JA,IAA,ZR和GA₃在半夏倒苗前后起着重要的调控作用。

Change of endogenous hormone around sprout tumble of Pinellia ternata under high temperature stress

OBJECTIVE: To study the change of endogenous hormone (ABA, IAA, JA, GA3, ZR) in the leaves, petioles, tubers of Pinellia ternate around sprout tumble. It also provided some valuable information to prevent sprout tumble and increase production. METHOD: Tubers of P. ternata were cultured firstly at (23 +/- 1) degree C for certain days, and then they were coerced under (30 +/- 1 ) degree C stress in the same artificial climate boxes. The endogenous hormones in leaves, petioles and tubers during different stages of high temperature stress were determined with Enzyme-linked Immunosorbent Assays (ELISA). RESULT: After under high temperature stress, ABA content in leaves, petioles and tubers increased obviously. Similarly, JA content rose all in the leaves, petioles and tubers. But in the same conditions IAA content declined significantly in the leaves and petioles. In the tubers, IAA content also decreased, but not quickly. With the extension of high temperature coercion, the leaves, petioles, tubers, ZR content were gradually falling off. In the leaves of GA3 content rose markedly at the third day, fell down at the sixth day, but remained higher than before treatment. With the extension of the processing time, GA3 content fell off in the petioles and tubers. CONCLUSION: ABA, JA, ZT and GA3 played an important role in controlling sprout tumble of P. ternata.