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Effects of plant growth regulator on endogenous hormone levels during the period of the

Vol. 1, No. 1 Journal of Agricultural Science

Effects of Plant Growth Regulator on Endogenous Hormone Levels

during the Period of the Red Globe Growth

Juan He

College of Agriculture, Shihezi University

Shihezi 832003, China

E-mail: hjmc111@http://www.wendangxiazai.com

Songlin Yu (corresponding author)

College of Agriculture, Shihezi University

Shihezi 832003, China

E-mail: songliny@http://www.wendangxiazai.com

Chao Ma

College of Agriculture, Shihezi University

Shihezi 832003, China

E-mail:mchj111@http://www.wendangxiazai.com

Abstract

Objective. The present study was aimed to elucidate the dynamic changes of endogenous hormone levels during the fruit growth and the changing regulation of endogenous hormone levels between normal and abnormal fruits. Methods. After using exogenous GA3 and GA3+6-BA, endogenous hormone levels such as indoleacetic acid(IAA), cytokinin(ZR), abscisic acid(ABA) and gibberellin(GA3) in normal fruits and rigid abnormal ones were determined by enzyme-linked immunosorbent assays(ELISA), respectively.

Results. The results indicated that the treatments of 20mg/kg GA3 and the combination of 20mg/kg GA3+10 mg/kg 6-BA had no remarkable effects on increasing average weight of berries where the vertical diameter of grape fruits was longer than the transverse diameter. Exogenous hormone GA3 and GA3+6-BA mixture also affected the endogenous hormone levels. The content of IAA, ABA and ZR was lower in the rigid abnormal fruits than that in the normal ones, respectively, and those levels during the rapid growth period were nearly in accordance with those during the slow growth period.

Conclusion. The fruit growth was closely related to the endogenous hormone levels.

Keywords: Plant growth regulator, Grape, Fruit growth, Endogenous hormone

1.Introduction

Applications of plant growth regulators have been focused by many researches in areas of plant physiology and nutriology(Pan, 1999, PP. 1-2, Amarjit, 2000, PP. 1-16). The regulators have been intensively and extensively applied for agriculture production, and played a vital role in the growth and development of plants. Along with the development of intensive cultivation of fruits, applications of regulators for controlling the growth of fruits have been progressively paid more attention (Ma, 1998, PP. 27-36).

Phytohormone, used as trace signal molecule in plants, has very important significance in regulating all kinds of growth processes and environmental responses, and meanwhile , made great contribution to the agricultural chemical control of crops, fruits and vegetables (Xu, 2006, PP. 433-442). Phytohormone mainly regulates the the plant physiological processes such as growth and development, organ formation and so on. The dynamic changes of endogenous hormone levels during the period of fruit growth have been investigated by many researchers. Meng et al(2005, PP. 6-10) studied 92

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