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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (5): 1390-1399    DOI: 10.7522/j.issn.1000-694X.2013.00204
Biology and Soil     
Effects of α-Naphthalene Acetic Acid on Yield and Endogenous Hormones of Greenhouse Grown Pepper in Desert Area
ZHANG Hong-ju1,2, ZHAO Huai-yong3, YU Ji-hua1
1.College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China;
2.Agricultural and Bio-technical College, Hexi University, Zhangye 734000, Gansu, China;
3.Zhangye Extension Center for Agricultural Techniques, Zhangye 734000, Gansu, China
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Abstract  

Effects of different α-naphthalene acetic acid sodium (α-NaNAA) treatments on yield and endogenous hormone levels of pepper (Long-jiao NO.2, bred by the Gansu Academy of Agricultural Sciences) growing in greenhouse were studied. Results showed that foliar spraying α-NaNAA of 35 mg·L-1 significantly improved fruit weight per plant during the late growth stages, decreased flower and fruit abscissions at different growth stages. It also significantly promoted dry matter accumulation and growth rates of the root systems and above ground parts during the middle and late growth stages, as well as phase yield per plant at different stages, by improving nutritional conditions for pepper plant. Fruit weight and mean yield per plant induced by α-NaNAA of 35 mg·L-1 were improved by 15.76% and 43.18% while the flower and fruit abscissions were decreased by 19.77%, as compared to the control. Foliar spraying α-NaNAA of  30-35 mg·L-1 significantly reduced the concentrations of foliar endogenous hormones such as abscisic acid (ABA) and indole acetic acid (IAA). The reduction effect was more significant when α-NaNAA applied at 30-35 mg·L-1. It also changed the concentrations and distributions of pepper endogenous hormones such as gibberellins (GA) and zeatins (ZR). Yield per pepper plant was significantly positively correlated with ZR rates at leaves while negatively correlated with IAA and ABA rates at leaves and was insignificantly correlated with GA rates.

Key words:  pepper      α-naphthalene acetic acid sodium      yield      endogenous hormones     
Received:  20 May 2013      Published:  23 June 2013
ZTFLH:  S641.3  

Cite this article: 

ZHANG Hong-ju1,2, ZHAO Huai-yong3, YU Ji-hua1. Effects of α-Naphthalene Acetic Acid on Yield and Endogenous Hormones of Greenhouse Grown Pepper in Desert Area. JOURNAL OF DESERT RESEARCH, 2013, 33(5): 1390-1399.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00204     OR     http://www.desert.ac.cn/EN/Y2013/V33/I5/1390

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