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Pak. J. Bot., 49(1): 25-32, 2017.

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COMPARISON OF DYNAMIC CHANGES IN ENDOGENOUS HORMONE

LEVEL, WATER CONTENT AND WATER-SOLUBLE SUGARS IN

CAMELLIA OLEIFERA OF DIFFERENT AGES

JUANJUAN HU¹ , FAHEEM AFZAL SHAH¹, WEI WU², ZHIHUA CAO³,

QINGLONG  SHU^1* AND SONGLING FU^1*

¹School of Forest and Landscape Architecture, Anhui Agricultural University, Hefei, Anhui 230036,China

²Agricultural Engineering Research Institute, Anhui Academy of Agricultural Science, Hefei, Anhui 230036, China

³Institute of Commercial Forest, Anhui Academy of Forestry, Hefei, Anhui 230031, China

^*Corresponding author’s e-mail: qinglongshu@sina.com; Tel: 0086-551-65786561; Fax: 0086-551-65786512

^*Corresponding authors contributed equally

Abstract

 The aim of this study is to investigate and understand the dynamic changes and the possible functions of hormones, water and sugar content during the development of C. oleifera. We analyzed and compared WWC, WSS and five endogenous hormones (DHZR, ZR, GA, IAA and ABA) contents between May and August in C. oleifera plants at different ages from the same orchard. The results showed that WWC, WSS, DHZR, ZR, GA, IAA and ABA contents varied from 61.64%-74.15%, 21.24mg/g-62.44mg/g, 6.237ng/g-38.342ng/g, 6.215ng/g-16.721ng/g, 5.668ng/g-18.024ng/g, 24.753ng/g-147.507ng/g and 66.541ng/g-156.212ng/g, respectively. WWC showed a decrease-increase-decrease variation pattern, while the WSS contents demonstrated a generally increasing trend with increasing tree age. The levels of ABA in leaves sampled in August was higher than that in May, but the opposite was found for the GA and IAA levels. Tree ages were negatively correlated with ZR and GA concentration at the 1% or 5% significance level. The results of this study broaden our understanding of the interrelationships between phytohormones, WWC, and WSS content in the growth and development of C. oleifera.

Key words: C. oleifera; Tree age; Water content; Water-soluble sugar content; Endogenous hormone levels.