4.7 Article

Gibberellins Play a Role in Regulating Tomato Fruit Ripening

期刊

PLANT AND CELL PHYSIOLOGY
卷 60, 期 7, 页码 1619-1629

出版社

OXFORD UNIV PRESS
DOI: 10.1093/pcp/pcz069

关键词

Gibberellins; Ethylene biosynthesis; Negative role; Tomato ripening

资金

  1. China Postdoctoral Science Foundation [2015M581812, 2016T90471]
  2. Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
  3. Top-notch Academic Programs Project of Jiangsu Higher Education Institutions [PPZY2015B173]

向作者/读者索取更多资源

Although exogenous applications of gibberellins (GAs) delay tomato ripening, the regulatory mechanisms of GAs in the process have never been well recognized. Here, we report that the concentration of endogenous GAs is declined before the increase of ethylene production in mature-green to breaker stage fruits. We further demonstrate that reductions in GA levels via overexpression of a GA catabolism gene SlGA2ox1 specifically in fruit tissues lead to early ripening. Consistently, we have also observed that application of a GA biosynthetic inhibitor, prohexadione-calcium, at the mature-green stage accelerates fruit ripening, while exogenous GA(3) application delays the process. Furthermore, we demonstrate that ethylene biosynthetic gene expressions and ethylene production are activated prematurely in GA-deficient fruits but delayed/reduced in exogenous GA(3)-treated WT fruits. We also show that the GA deficiencymediated activation of ethylene biosynthesis is due to the activation of the ripening regulator genes RIN, NOR and CNR. In conclusion, our results demonstrate that GAs play a negative role in tomato fruit ripening.

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