植物研究 ›› 2023, Vol. 43 ›› Issue (4): 582-590.doi: 10.7525/j.issn.1673-5102.2023.04.011
常二梅1, 董遥2, 刘建锋1, 贾子瑞1, 李香3, 赵秀莲1, 郭伟1,4(
)
收稿日期:2023-02-28
出版日期:2023-07-20
发布日期:2023-06-30
通讯作者:
郭伟
E-mail:wwwguoweinet@163.com
作者简介:常二梅(1981—),博士,副研究员,主要从事古树生物学的研究。
基金资助:
Ermei CHANG1, Yao DONG2, Jianfeng LIU1, Zirui JIA1, Xiang LI3, Xiulian ZHAO1, Wei GUO1,4(
)
Received:2023-02-28
Online:2023-07-20
Published:2023-06-30
Contact:
Wei GUO
E-mail:wwwguoweinet@163.com
About author:E-mail:wwwguoweinet@163.comSupported by:摘要:
为探讨树龄对侧柏(Platycladus orientalis)古树扦插生根的影响及扦插过程中的生理机制,从树龄分别为5、100、300、700天的侧柏母树上取插穗进行扦插繁殖,以4个不同生根阶段(0 d(S1,扦插前)、35 d(S2,愈伤组织形成期)、65 d(S3,不定根形成期)、95 d(S4,不定根伸长期))插穗基部的韧皮部为材料,测定生理指标含量的动态变化,并统计生根率和生根数量。结果表明:取自侧柏古树插穗与幼树插穗相比,生根率显著降低、生根数量显著减少(P<0.05)。取自5年侧柏的插穗的营养物质(总糖、总蛋白)含量、抗氧化酶(酚氧化酶(PPO)、过氧化物酶(POD)、超氧化物歧化酶(SOD))活性、激素[内源吲哚乙酸(IAA)、玉米素核苷(ZR)]含量在4个扦插生根阶段显著高于侧柏古树(P<0.05),说明这些物质含量高有利于插穗生根。丙二醛(MDA)、脱落酸(ABA)、赤霉素(GA)含量随侧柏树龄的增长呈现显著增长的趋势(P<0.05),说明侧柏古树插穗的有害物质和抑制生根的激素含量较多。营养物质(总糖、总蛋白)、激素(IAA、GA)含量在4个生根阶段中呈现先增高后降低的趋势,在S3时最高(P<0.05)。相反,ABA含量在S3时显著低于其他3个阶段(P<0.05),说明不定根形成阶段(S3)是扦插过程中的关键阶段,ω(IAA)/ω(ABA)、ω(ZR)/ω(ABA)比值越大,越有利于不定根形成。树龄显著影响侧柏扦插生根率,但是,不同年龄的侧柏古树的扦插生根率差异不显著。而有利于扦插生根的营养物质(总糖、总蛋白)、抗氧化酶(PPO、POD、SOD)活性、激素(IAA、ZR)含量少是侧柏古树生根难的原因。
中图分类号:
常二梅, 董遥, 刘建锋, 贾子瑞, 李香, 赵秀莲, 郭伟. 不同树龄侧柏古树扦插生根过程中的生理响应[J]. 植物研究, 2023, 43(4): 582-590.
Ermei CHANG, Yao DONG, Jianfeng LIU, Zirui JIA, Xiang LI, Xiulian ZHAO, Wei GUO. Physiological Response of Ancient Platycladus orientalis with Different Ages During Cutting Rooting Process[J]. Bulletin of Botanical Research, 2023, 43(4): 582-590.
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