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Global analysis of basic leucine zipper transcription factors in trifoliate orange and the function identification of PtbZIP49 in salt tolerance

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Horticultural Plant Journal 2024年第1期10卷 115-130页

作者： Yuanyuan Xu Qiuling Hui Meng Li Hongxian Peng Yizhong He Changpin Chun Liangzhi Peng Xingzheng Fu National Citrus Engineering Research Center Citrus Research InstituteSouthwest UniversityChongqing 400712China

As one of the most widely distributed and highly conserved transcription factors in eukaryotes,basic leucine zipper proteins(bZIPs)are involved in a variety of biological processes in plants,but they are largely unknown in *** this study,56 bZIP family members were identified genome-wide from an important citrus rootstock,namely trifoliate orange(Poncirus trifoliata ***.),and these putative bZIPs were named PtbZIP1—*** PtbZIPs were classified into 13 subgroups by phylogenetic comparison with Arabidopsis thaliana bZIPs(AtbZIPs),and they were randomly distributed on nine known(50 genes)chromosomes and one unknown(6 genes)*** analysis revealed the detailed characteristics of PtPZIPs,including their amino acid length,isoelectric point(pI),molecular weight(MW),predicted subcellular localization,gene structure,and conserved *** of promoter elements suggested the presence of drought,low-temperature,wound,and defense and stress responsive elements,as well as multiple hormone-responsive cis-acting *** expression analysis showed the transcriptional patterns of PtbZIPs in different tissues and under dehydration,high salt,ABA,and IAA *** addition,21 PtbZIPs were predicted to have direct or indirect protein—protein *** these,PtbZIP49 was experimentally proven to interact with PtbZIP1 or PtbZIP11 by using a yeast two-hybrid assay and bimolecular fluorescence complementation(BiFC).Subcellular localization analysis further revealed that PtbZIP1,PtbZIP11,and PtbZIP49 were localized in the ***,PtbZIP49 was functionally identified as having an important role in salt stress via ectopic expression in *** and silenced in trifoliate orange using virus-induced gene silencing(VIGS).This study provided comprehensive information on PtbZIP transcription factors in citrus and highlights their potential functions in abiotic stress.

关键词： bZIP Citrus trifoliate orange Abiotic stress Expression pattern

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Differences in Several Endogenous Phytohormones Between the Dwarfing and Normal trifoliate orange Rootstocks

Differences in Several Endogenous Phytohormones Between the ...

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2005年全国植物生长物质研讨会

作者： Carol J Lovatt Department of Botany and Plant Sciences University of CaliforniaRiversideCA 92521USA

＜正＞‘Flying Dragon’ trifoliate orange （Poncirus trifoliata cv. monstrosa） is a commercially important dwarfing rootstock widely used by the citrus industry. However, the mechanism of its strong dwarfing effect is poorly understood. In an attempt to study the role of phytohormones for the scion-rootstock interaction on tree vigor, uniform 1 year-old seedlings of both the dwarfing ’Flying Dragon’ and normal trifoliate orange （Poncirus trifoliata ***.） rootstocks were hydroponically grown directly from seeds in the greenhouse. The endogenous indole-3-acetic acid （IAA）, abscisic acid （ABA）, gibberellic acid （GA3） and isopentenyl adenosine （iPA） in different parts of both rootstocks were analyzed using standard radioimmunoassay （RIA） . The results were showed as follows:

关键词： trifoliate orange rootstock vigor phytohormones IAA ABA

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