生长调节剂对自然低温下红海榄幼苗生理特性的影响∗

贾湘璐; 欧阳子龙; 樊东函; 滕维超; 刘秀; 石景忠

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生长调节剂对自然低温下红海榄幼苗生理特性的影响∗
贾湘璐^1,2,3,4,5, 欧阳子龙⁴, 樊东函³, 滕维超², 刘秀¹, 石景忠²
1.广西壮族自治区林业科学研究院;2.广西大学;3.钦州市林业科学研究所;4.南宁植物园;5.南宁青秀山风景名胜旅游开发有限责任公司

摘要:

为探究生长调节剂对冬季自然低温条件下红海榄 Rhizophora stylosa 幼苗生理特性的影响, 并为其幼苗繁殖保育工作提供理论依据和指导, 研究以红海榄 2 个月实生苗为试验材料, 选择 6 -BA、 NAA、 GA3 、 IAA 共 4 种生长调节剂进行试验处理, 测定叶片光合色素、丙二醛 (MDA) 和抗氧化酶活性指标, 进行相关性和主成分分析。结果表明, 自然低温下连续喷施 1 ~ 3 个月不同种类和浓度的生长调节剂均能有效提高红海榄幼苗 CHLa、 CHLb、 CHLa+b 和 CC 质量分数并降低 MDA 质量摩尔浓度; SOD、 POD、 CAT 和 APX 活性则随时间波动变化。相关性分析表明, 红海榄各生理指标间存在一定的协同作用, 且抗氧化酶活性、光合色素均与 MDA 呈负相关。主成分综合得分排名为 150 mg·L -1 IAA＞50 mg·L -1 NAA＞100 mg·L -1 NAA＞ 100 mg·L -1 IAA＞ 400 mg·L -1 GA3 ＞ 400 mg·L -1 6-BA＞ 150 mg·L -1 NAA＞200 mg·L -1 6-BA＞200 mg·L -1 GA3＞100 mg·L -1 GA3＞50 mg·L -1 IAA＞100 mg·L -1 6-BA ＞CK。生长调节剂能有效改善自然低温下红海榄幼苗的生理状态, 其中 150 mg·L -1 IAA 处理效果最佳。

关键词: 生长调节剂红海榄自然低温幼苗生理特性

DOI：

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基金项目:广西重点研发计划项目 (桂科 AB24010288), 广西壮族自治区林业科学研究院团队项目 (2024RT27), 广西林业科技推广示范项目 (桂林科研 [2021] 1 号)。

Effects of Growth Regulators on Physiological Characteristics of Rhizophora stylosa Seedlings under Natural Low Temperature

JIA Xianglu,欧阳子龙,樊东函,滕维超,刘秀,SHI Jingzhong

1.Nanning Botanical Garden;2.Qinzhou Forestry Research Institute;3.Guangxi University;4.Guangxi Academy of Forestry Sciences

Abstract:

To investigate the effects of plant growth regulators on physiological characteristics of Rhizophora stylosa seedlings under natural low temperature in winter, and to provide a theoretical basis and guidance for the reproduction and conservation of R. stylosa seedlings, four growth regulators, 6 - BA, NAA, GA3 and IAA, were selected as experimental materials to determine the photosynthetic pigment, MDA content and antioxidant enzyme activity indexes in the leaves of 2 months R. stylosa seedlings. The correlation among the indexes was calculated and the comprehensive score ranking was calculated by principal component analysis. The results showed that the concentrations of CHLa, CHLb, CHLa+B, and CC were increased and the concentrations of MDA were decreased by spraying different kinds and concentrations of plant growth regulators for 1 to 3 months under the natural low temperature condition. The activity of SOD, POD, CAT and APX fluctuated with time. Correlation analysis showed that there was a certain synergistic effect among the physiological indexes of R. stylosa, and the antioxidant enzyme activities and photosynthetic pigments were negatively correlated with MDA. The overall score of principal component was 150 mg·L -1 IAA＞ 50 mg·L -1 NAA＞ 100 mg·L -1 NAA＞100 mg·L -1 IAA＞400 mg·L -1 GA3＞400 mg·L -1 6-BA＞150 mg·L -1 NAA＞200 mg·L -1 6-BA ＞200 mg·L -1 GA3＞100 mg·L -1 GA3＞50 mg·L -1 IAA＞100 mg·L -1 6-BA＞CK. Plant growth regulators can effectively improve the physiological state of R. stylosa under natural low temperature, and 150 mg·L -1 IAA treatment has the best effect.

Key words: growth regulator Rhizophora stylosa natural low temperature seedlings physiological characteristics

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