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http://dx.doi.org/10.7235/hort.2012.12031

Analyses for Early Growth of Terminal Shoots in Persimmon  

Yoon, Young-Whang (Sweet Persimmon Research Institute, Gyeongsangnam-do Agricultural Research & Extension Services)
Choi, Seong-Tae (Sweet Persimmon Research Institute, Gyeongsangnam-do Agricultural Research & Extension Services)
Park, Doo-Sang (Sweet Persimmon Research Institute, Gyeongsangnam-do Agricultural Research & Extension Services)
Rho, Chi-Woong (Research and Development Bureau, Gyeongsangnam-do Agricultural Research & Extension Services)
Kang, Seong-Mo (Department of Horticulture, Gyeongsang National University)
Publication Information
Horticultural Science & Technology / v.30, no.4, 2012 , pp. 385-391 More about this Journal
Abstract
The growth of terminal shoots of persimmon (Diospyros kaki) was analyzed during the first two months from the time of bud sprout to understand the dynamics of their early growth. Field-grown, mature 'Fuyu' and 'Nishimurawase' trees were used in a three-year study at two locations in Gyeongnam province. The growth of terminal shoots was most active from late April, about 10 days after foliation, to early May, followed by a gradual decline by late May. The increase in leaf area continued unabated throughout May. The weight of a flower bud increased slowly until early May and rapidly after flowering. Although its extension growth had been ceased by late May, dry weight (DW) of a terminal shoot continued to increase almost linearly throughout May due to shoot thickening and continued growth of leaves and fruits. In late May, the leaves and the stem accounted for more than 60% and less than 20% of total DW of a shoot respectively; fruit proportion increased to 7 to 17% by then. Relative growth rate (RGR) of the terminal shoot was higher than 213 $mg{\cdot}g^{-1}{\cdot}d^{-1}$ in late April, but declined to less than 63 $mg{\cdot}g^{-1}{\cdot}d^{-1}$ in late May. Like the pattern of seasonal changes in RGR, net assimilation rate (NAR) of the shoots decreased from 1.9 to 2 $mg{\cdot}cm^{-2}{\cdot}d^{-1}$ to 0.5 to 0.8 $mg{\cdot}cm^{-2}{\cdot}d^{-1}$. An early-season 'Nishimurawase' did not differ from a late-season 'Fuyu' in RGR and NAR during the first two months of growth. The early growth of the shoots was affected mainly by the reserves redistributed from permanent organs, however, environmental conditions at the time was also involved.
Keywords
Diospyros kaki; dry weight; net assimilation rate (NAR); relative growth rate (RGR);
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