摘要
5 -氨基乙酰丙酸 (ALA) 10mg·L-1处理能够明显提高弱光下生长的甜瓜幼苗叶片净光合速率 (Pn) ,而低温胁迫明显降低甜瓜幼苗叶片光合能力。经ALA处理过的甜瓜幼苗光合表观量子效率、羧化效率、气孔开度、叶片叶绿素 (特别是叶绿素b)和可溶性糖含量均显著增加。在ALA处理 3d之后 ,将幼苗转移到 8℃低温条件下 4h ,对照叶片光合能力基本丧失 ,而ALA处理叶片仍能维持一定的光合能力 ,并在 2 0h内基本恢复至对照水平。若幼苗在低温下处理 6h ,对照植株完全死亡 ,而ALA预处理植株仅出现少量伤害症状。本研究结果表明 。
Irrigation with exogenous 5 aminolevulinic acid(ALA)significantly promoted leaf net photosynthetic rate(Pn)of melon( Cucumis melo L.'Ximiya 1') seedlings grown under low light irradiation,as well as the plants treated by 8℃ chilling stress.The leaves of the plants treated with 10 mg·L -1 ALA solutions showed higher apparent quantum yield(AQY),carboxylation efficiency(CE),chlorophyll (especially chlorophyll b)content,dark respiration and bigger stomata aperture but lower respiration under light.Furthermore,after seedlings were transferred to 8℃ chilling for 4 hours and then recovered at 25-30℃ for 2 hours,the photosynthesis of the control leaves was only 12%-18% of that before chilling,while that in the ALA pretreated leaf was 22%-38%,which would further recovered in 20 hours to 76%-101% of the control before chilling treatment.If the seedlings were chilled for 6 hours,the control plants all died while the ALA pretreated ones only showed a few injury symptoms in the leaf margin.The analysis also showed that the soluble sugar content of leaves in ALA pretreated plants was very significantly higher than that of control,which might be partly responsible for the higher chilling tolerance.The evidence presented here suggested that ALA treatment might promote low light tolerance and chilling tolerance of plants.
出处
《园艺学报》
CAS
CSCD
北大核心
2004年第3期321-326,共6页
Acta Horticulturae Sinica
基金
国家教育部出国留学人员基金资助项目 (G2 0 0 2 14 )
