茉莉酸甲酯对平邑甜茶光合、根构型及氮吸收的影响

Effects of methyl jasmonate on photosynthetic characteristics, root configuration and nitrogen uptake in Malus hupehensis

茉莉酸甲酯能够明显影响果树的生长发育。为探索茉莉酸甲酯(MeJA)在苹果树生长发育中的作用,以苹果砧木平邑甜茶幼苗为试材,采用水培法开展叶面喷施茉莉酸甲酯对平邑甜茶光合、根系构型及氮素吸收的影响研究。结果显示,喷施茉莉酸甲酯能促进平邑甜茶植株生长、改善根构型及增强根活力、提高叶片叶绿素含量与净光合速率,影响根系对氮素等养分的吸收利用。中等浓度(2.5μmol·L^(-1))喷施效果最显著,而喷施高浓度(250μmol·L^(-1))的茉莉酸甲酯对植株生长、光合作用等有一定抑制作用。

Methyl jasmonate can significantly affect the growth and development of fruit trees.In order to explore the role of methyl jasmonate(MeJA)in the growth and development of apple trees,the apple rootstock Malus hupehensis Rehd.seedlings were used as the test materials,and the effects of foliar spraying of methyl jasmonate on photosynthesis,root configuration and nitrogen uptake of M.hupehensis Rehd.seedlings were stud-ied by hydroponic method.The results showed that spraying methyl jasmonate could promote the growth of M.hupehensis,improve root configuration and enhance root vitality,increase leaf chlorophyll content and net photo-synthetic rate,and affect the uptake and utilization of nitrogen and other nutrients by roots.Medium concentration of methyl jasmonate(2.5μmol·L^(-1))had the most significant effect,while higher concentration of methyl jasmonate(250μmol·L^(-1))had certain inhibitory effects on the plant growth and photosynthesis.