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Allelopathic Effects of Aqueous Extract of Torreya fargesii aril on Seed Germination and Seedling Growth of Radish, Mustard and Cabbage

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Agricultural Biotechnology 2016年第4期5卷 11-17页

作者： Xiaoling XIE Bo JIANG Xianrong ZHOU Lianxue ZHAO Jianhua WANG Jin HANG College of Life Science and Technology Yangtze Normal UniversityFuling 408100China Zhenxiong County Yile Middle School Zhenxiong 657200China

[Objective] This study aimed to investigate the allelopathic effects of Torreya fargesii aril. [Method] By indoor bioassay, the effects of different con-centrations （10, 20,40, 80 g/L） of aqueous extract of T. fargesii aril on seed germination rate, seedling root length, seedling height, fresh weight, chlorophyll content, malondialdehyde （MDA） content and anti oxidative enzyme activities of radish, mustard and cabbage were analyzed and compared. [ Result] Different concentrations of aqueous extract of T. fargesii aril inhibited seed germination and seedling growth of three crops, and the inhibitory effects were enhanced with the increase of concentration. Seedling height and fresh weight of three crops were improved by low concentrations of aqueous extract of T. fargesii aril and inhibited by high concentrations of aqueous extract. Overall, aqueous extract of T. fargesii aril exhibited allelopathic inhibitory effects on three crops, and the level of allelopath-ic inhibitory effects demonstrated a descending order of radish 〉 mustard 〉 cabbage. Compared with the control group, 80 g/L aqueous extract of T. fargesii aril almost significantly reduced seed germination rate, seedling root length, seedling height, fresh weight and chlorophyll content, and significantly improved MDA con-tent and antioxidative enzyme （SOD, CAT, POD） activities of radish, mustard and cabbage （P 〈 0 .0 5 ） . [ Conclusion] Aqueous extract of T. fargesii aril exhibited remarkable allelopathic inhibitory effects on seed germination of radish, mustard and cabbage, which indicated that there might be dormancy-associated germination in-hibiting allelochemicals in T. fargesii aril. This study provided theoretical basis for subsequent clarification of the mechanism of seed dormancy of T. fargesii.

关键词： Torreya fargesii Franch. aril Aqueous extract Seed germination Allelopathic effect

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Molecular cloning,characterization and expression profile of the sucrose synthase gene family in Litchi chinensis

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Horticultural Plant Journal 2021年第6期7卷 520-528页

作者： Dan Wang Jietang Zhao Yaqi Qin Yonghua Qin Guibing Hu State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources/Key Laboratory of Biology and Genetic Improvement of Horticultural Crops(South China) Ministry of Agriculture and Rural Affairs/Guangdong Litchi Engineering Research CenterCollege of HorticultureSouth China Agricultural UniversityGuangzhou 510642China

Sucrose synthase(SUS,EC 2.***.1.13)is widely considered as a key enzyme involved in plant sucrose metabolism,and the gene family encoding different SUS isozymes has been identified and characterized in several plant ***,to date scant information about the SUS genes is available in Litchi chinensis ***,we identified five SUS genes in *** Lc SUSs shared high levels of similarity in both nucleotide and amino acid *** gene structure,phylogenetic relationships,and expression profiles were *** structure analysis indicated that the Lc SUSs have similar exon-intron *** analysis revealed that the five members could be classified into three groups(LcSUS1 and LcSUS2 in SUSⅡ,LcSUS4 and LcSUS5 in SUSⅢ,and LcSUS3 in SUSⅠ),demonstrating evolutionary conservation in the SUS family across litchi and other plant *** expression levels of Lc SUSs were investigated via real-time PCR in various tissues and different developmental stages of *** tissues and organs,Lc SUSs exhibited distinct but partially redundant expression profiles in litchi,being predominantly expressed in young leaves(sink).During aril development,the expression pattern of LcSUS1 was consistent with the trend of sugar accumulation,indicating it may play important roles in determination of sink strength in ***,transcript levels of LcSUS2,LcSUS4,and LcSUS5 varied between cultivars with different hexose/sucrose ratios,which may regulate the sugar composition in *** results provide insights into physiological functions of SUS genes in litchi,especially roles in regulating sugar accumulation in aril.

关键词： Litchi chinensis Sucrose synthase Gene expression aril Sugar accumulation

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