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Acta Horticulturae Sinica ›› 2023, Vol. 50 ›› Issue (3): 461-474.doi: 10.16420/j.issn.0513-353x.2021-1215

• Research Papers •     Next Articles

Studies on Mechanisms of ALA Alleviating ABA Inhibiting Root Growth of Strawberry

RAO Zhixiong1, AN Yuyan1, CAO Rongxiang2, TANG Quan2, WANG Liangju1,*()   

  1. 1College of Horticulture,Nanjing Agricultural University,Nanjing 210095,China
    2Institute of Agricultural Sciences in Jiangsu Hilly Area,Nanjing 210046,China
  • Received:2022-08-17 Revised:2022-11-04 Online:2023-03-25 Published:2023-04-03
  • Contact: *(E-mail:wlj@njau.edu.cn

Abstract:

The relationship among 5-aminolevulinic acid(ALA),abscisic acid(ABA)and auxin (IAA)in strawberry roots growth were discussed. It was found that exogenous ABA treatment significantly inhibited strawberry root growth,while ALA alleviated the inhibitory effect by ABA. ABA reduced the endogenous IAA content in the root tips of strawberry,while ALA promoted endogenous ABA content. The expressions of NCED1NCED2 and CYP707A,referring to ABA biosynthesis and catabolism,respectively,were not different among treatments,whereas that of PYL4 and PYL8,both coding ABA receptors,and SnRK2.1SnRK2.2SnRK2.3SnRK2.4SnRK2.5 and SnRK2.6,which code the protein kinases in ABA signaling pathway were up-regulated by ABA but not mediated by ALA. These results suggested that the genes in ABA signaling route were not involved in ALA-ABA regulating root growth of strawberry. On the other hand,ABA down-regulated expressions of YUC2YUC3(referring to IAA synthesis) and AUX1(coding auxin influx carrier). However,the down-regulation of gene expressions by ABA were not reversed by ALA. This also means that these genes are not so important in ALA-ABA-regulated root growth of strawberry. Nevertheless,the expression of PIN1,which codes IAA exporter carrier,was down-regulated by ABA,and ALA reversed the down-regulation,suggesting that PIN1 may be involved in ALA-ABA regulating root growth of strawberry. In a transgenic Arabidopsis carrying the green fluorescent protein gene(GFP),it was found that AtPIN1-GFP expression was inhibited by ABA and reversed by ALA. Bioinformatic analysis showed that the amino acid sequence of FaPIN1 in the cultivated strawberry is high homology with many Rosaceous plants,with several transmembrane regions located at both ends of the polypeptide. When FaPIN1-GFP was transferred into tobacco (Nicotiana benthamiana),the fluorescence was distributed in the plasma membrane. When the cloned FaPIN1 was constructed into an estradiol-induced expression vector and transformed into Arabidopsis,the root growth of the transgenic plants was less sensitive to ABA treatment,and the ALA mitigation was also less significant. These results suggest that FaPIN1 is an important factor during ALA-ABA regulating root growth,and the alleviation of ALA on ABA-inhibiting root growth may be dependent on the promotion of IAA polar transport in the root tip of strawberry.

Key words: Fragaria × ananassa, root, growth, 5-aminolevulinic acid, ABA, auxin

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