Effects of photosynthetic characteristics and sugar metabolism of fruit mulberry in different breeding methods

doi:10.14088/j.cnki.issn0439-8114.2019.16.020

Abstract

Abstract: In order to study the effects of different breeding methods on photosynthetic characteristics, sugar accumulation and related enzyme activities, the cuttings （QC） and grafting （JJ） were selected to breeding fruit mulberry DA10, and the gas exchange parameters of mulberry leaves were determined. Diurnal changes, dynamic changes, and soluble sugar content and sucrose metabolism-related enzyme activities in different developmental stages of mulberry. The results showed that the daily variation curves of net photosynthetic rate（Pn） in the two breeding methods showed a double-peak curve with obvious photosynthetic “noon break” phenomenon, but the second peak of QC fruit mulberry was higher than the JJ fruit mulberry peak, and the transpiration rate（Tr） daily variation curve for the bimodal curve, the maximum peak value of Tr was QC>JJ. The utilization efficiency（LUE） and the instantaneous water use efficiency（WUE） were QC>JJ, and the apparent CO₂ utilization efficiency （CUE） was JJ>QC. There were differences in the content of sugar components in different developmental stages of mulberry. The content of soluble sugar（Tss） increased linearly from red fruit stage. The accumulation of sugar was mainly fructose（Fru） and glucose（Glc）, which was the fruit of sucrose（Can） and hexose accumulation. SS and SPS activities were similar as changes in developmental processes. The activity of mulberry NI in different breeding methods was more active in the whole development stage than in the early stage. The correlation between photosynthetic physiological parameters and mulberry sugar accumulation and sucrose metabolism related enzyme activities showed that Tss, Fruand,Glc were were in positive correlation with Pn,LUE,CUE and WUE. The differences in the content of QC and JJ sugar indicated that different breeding methods had an impact on the transportation and distribution of mulberry light contract compound.

Key words: breeding, fruit mulberry, photosynthetic characteristics, sugar metabolism

CLC Number:

S663.9

ZHOU Jian-hua, LI Yong, YU Cui, MO Rong-li, ZHU Zhi-xian, DONG Zhao-xia, HU Xing-ming, DENG Wen. Effects of photosynthetic characteristics and sugar metabolism of fruit mulberry in different breeding methods[J]. HUBEI AGRICULTURAL SCIENCES, 2019, 58(16): 89-95.

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