Analysis of dynamic changes in endogenous hormones and carbon and nitrogen nutrition in different parts of leaves of Korla Fragrant Pear

doi:10.6048/j.issn.1001-4330.2025.04.015

Abstract

Abstract:

【Objective】 To study the dynamic changes of endogenous hormones and carbon and nitrogen nutrition in different parts of leaves of Korla Fragrant Pear tree in the hope of providing theoretical basis for pear tree shaping and pruning. 【Methods】 Korla fragrant pear with a tree shaped main stem was used as the research object and samples of different parts of Fragrant Pear leaves were collected at 2 weeks((2 weeks after pollination,2WAP), 6 WAP, 10 WAP, 14 WAP, 18 WAP, and 22 WAP after pollination. Then the changes in endogenous hormones GA₃, IAA, ABA, ZR, total nitrogen, and total carbon in the leaves were measured and analyzed in different developmental stages. 【Results】 There was a certain pattern in the content and trend of endogenous hormones in the leaves of different parts of the Korla pear tree. From 2 WAP to 14 WAP after pollination, the contents of GA₃ and IAA in different parts of the leaves of the Korla pear tree remained at high levels, while ZR and ABA showed a"low-high-low" trend; After 14 WAP, the content of GA₃, ABA, and ZR in the leaves showed a decreasing trend, while the content of IAA showed a "high-low-high" trend. The variation trend of IAA/ABA and (IAA+ZR+GA₃)/ABA ratios in different parts of Korla pear leaves in different developmental stages showed a "W" shape. The ratio continuously decreased to the lowest value from 2 WAP to 6 WAP, and slowly increased from the lowest value from 6 WAP to 10 WAP. The ratio from 10 WAP to 22 WAP first decreased and then increased. The IAA/ABA and (IAA+ZR+GA₃)/ABA ratios were higher in the upper part than in the middle and lower part; During the growth period, the total carbon content of Korla pear leaves in different parts showed an overall trend of first decreasing and then increasing, while the total nitrogen content showed an overall trend of first decreasing and then slowly increasing. The C/N ratio showed an overall upward trend, and the total carbon and total nitrogen content of leaves in different parts showed a upper>middle>lower pattern. 【Conclusion】 There are certain patterns in the changes of endogenous hormones and carbon and nitrogen nutrition in different parts of leaves of Korla Fragrant Pear.

Key words: Korla Fragrant Pear; leaves; endogenous hormones; carbon and nitrogen nutrition

摘要：

【目的】研究库尔勒香梨(简称香梨)树体不同部位叶片内源激素及碳氮营养动态变化,为香梨树整形修剪提供理论依据。【方法】以树形为主干型的香梨为研究对象,于授粉后2 周(2 weeks after pollination,记作2 WAP)、6周(6 WAP)、10周(10 WAP)、14周(14 WAP)、18周(18 WAP)和22周(22 WAP)采集不同部位香梨叶片样本,测定分析叶片内源激素GA₃、IAA、ABA、ZR及全氮和全碳在不同发育时期的变化。【结果】不同部位香梨叶片内源激素含量及变化趋势存在一定规律,在授粉后2~14 WAP,香梨树体不同部位叶片中GA₃和IAA含量一直保持较高的水平,ZR和ABA呈“低-高-低”的趋势;在14 WAP以后,叶片内GA₃、ABA和ZR含量呈下降的趋势,IAA含量呈“高-低-高”的趋势。不同部位香梨叶片在不同发育时期IAA/ABA、(IAA+ZR+GA₃)/ABA比值变化趋势均呈“W”型,2~6 WAP比值持续降低至最低值,6~10 WAP比值均从最低值缓慢上升,10~22 WAP比值均呈先下降后升高的趋势,IAA/ABA、(IAA+ZR+GA₃)/ABA比值均上部大于中部和下部;生长期内不同部位香梨叶片全碳含量整体呈先下降后上升的趋势,全氮含量整体呈先下降后缓慢上升的趋势,C/N比值整体呈上升的趋势,不同部位叶片全碳和全氮含量均呈上部>中部>下部的规律。【结论】库尔勒香梨不同部位叶片内源激素及碳氮营养变化存在一定规律。

关键词: 库尔勒香梨, 叶片, 内源激素, 碳氮营养

CLC Number:

S661.2

WANG Zhendong, YAN Pan, CHEN Qiling, DENG Yonghui. Analysis of dynamic changes in endogenous hormones and carbon and nitrogen nutrition in different parts of leaves of Korla Fragrant Pear[J]. Xinjiang Agricultural Sciences, 2025, 62(4): 911-916.

王振东, 兖攀, 陈奇凌, 邓永徽. 库尔勒香梨不同部位叶片内源激素及碳氮营养的动态变化分析[J]. 新疆农业科学, 2025, 62(4): 911-916.

Figures/Tables 4

Fig.1 Changes in endogenous hormone content in leaves Changes in endogenous hormone contents of Fragrant pear leaves at different times

Fig.2 Changes of endogenous hormone ratios in Fragrant pear leaves at different periods of time

Fig.3 Changes in Fragrant pear leaf carbon and nitrogen content at different periods of time

Fig.4 Changes in Fragrant pear leaf C/N ratios at different time periods

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