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摘要
为探究植物激素对西瓜幼苗侧枝发育、膜脂过氧化反应和光合特性的影响,以黄小玉西瓜为试材,选择外源生长素[吲哚乙酸(IAA)]、细胞分裂素[6-苄氨基嘌呤(6-BA)]和脱落酸(ABA)3种激素,设置不同激素不同浓度喷施处理,定期测量西瓜幼苗株高、茎粗、侧枝长度、丙二醛(MDA)含量、超氧化物歧化酶(SOD)活性、过氧化物酶(POD)活性、净光合速率、蒸腾速率、气孔导度和胞间CO2浓度。结果表明,外源植物激素处理对西瓜侧枝发育、膜脂过氧化反应及光合特性的影响存在较大差异,低浓度的IAA处理能够抑制西瓜侧枝发育,并且可以促进植株生长,提高SOD和POD活性,降低MDA含量,提高净光合速率、气孔导度、胞间CO2浓度和蒸腾速率;低浓度的6-BA能够促进西瓜幼苗侧枝发育,促进植株生长,提高SOD和POD活性,降低MDA含量,提高净光合速率和气孔导度;ABA能够抑制西瓜幼苗侧枝发育,抑制植株生长,超过一定浓度可降低SOD活性,增加MDA含量,降低胞间CO2浓度。
Abstract
In order to investigate the effects of plant hormones on lateral branch development, membrane lipid peroxidation reaction and photosynthetic characteristics of watermelon seedlings, three hormones, exogenous growth hormone [indole acetic acid (IAA)], cytokinin [6-benzylaminopurine (6-BA)] and abscisic acid (ABA) were selected for the experiment, Huangxiaoyu watermelon as the test material, and spraying treatments were designed with different concentrations of different hormones, and watermelon seedling height, stem thickness were measured regularly, lateral branch length, MDA content, SOD activity, POD activity, net photosynthetic rate, transpiration rate, stomatal conductance and intercellular CO2 concentration were measured regularly. The results showed that the effects of exogenous phytohormone treatments on lateral branch development, membrane lipid peroxidation and photosynthetic characteristics of watermelon varied greatly, and low concentrations of IAA inhibited the development of watermelon lateral branches, promoted plant growth, increased SOD and POD activity, reduced MDA content, increased net photosynthetic rate, stomatal conductance, inter-cellular CO2 concentration, and enhanced the rate of transpiration; and low concentrations of 6-BA promoted the development of watermelon lateral branch length. promote plant growth, increase SOD and POD activity, reduce MDA content, enhance net photosynthetic rate, and increase stomatal conductance; ABA could inhibit the development of lateral branches of watermelon seedlings, inhibit plant growth, reduce SOD activity, increase MDA content, and reduce the intercellular CO2 concentration of watermelon seedlings.
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陈浩杰,江鸿,戴玉娟,杨欣,孙小武,戴思慧.
外源激素对西瓜幼苗侧枝发育、膜脂过氧化反应及光合特性的影响[J].
中国瓜菜, 2024, 37(3): 54-62 DOI:10.16861/j.cnki.zggc.202423.0629
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基金资助
国家重点研发计划(2020YFD1000300)
国家西甜瓜产业技术体系(CARS-25)