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| Effects of Different Altitudes on Growth and Culm-swelling of Zizania caduciflora（Turcz.）Hand. -Mazz. |
| DENG Jian-ping1，SHI Min2，HUANG Jian-zhong2*，GUO De-ping3，HU Zhen-liang4 |
| 1Dayang Town Agricultural Technology Extension Station of Jinyun County， Jinyun 321412， Zhejiang， China；2Institute of Nuclear-Agricultural Sciences， Zhejiang University， Hangzhou 310029， Zhejiang， China； 3College of Agriculture and Biotechnology， Zhejiang University， Hangzhou 310058， Zhejiang， China； 4Meteorology Bureau of Jinyun County， Jinyun 321400， Zhejiang， China |
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Abstract The present study investigates the effects of high altitudes（ 200-1 000 m） on the growth and culm-swelling of Zizania caduciflora（Turcz.）Hand. -Mazz.．The results showed that the sprouting date，leafing and peak value of plant height increase at high altitudes were significantly delayed and lower than those grown at lower altitudes．Sprouting of Zizania caduciflora（Turcz.）Hand. -Mazz. in high altitudes requires over 5 °C effective accumulated temperature than in low altitudes . Its leafing rate，plant height increasing speed showed positive correlation with the effective accumulated temperature in
various altitudes．Culm-swelling was observed to take place in the following order：410 m ＞ 650 m ＞1 008 m ＞ 815 m．The culm-swelling stage usually occurred during the period，when the temperature was suitable．Therefore，the effect of altitude on growth and culm-swelling of Zizania caduciflora （Turcz.）Hand.-Mazz. was mainly realized by temperature differences at different altitudes．Suppression of growth and metabolism of Ustilago esculenta by high temperature is most likely to be the limiting factor for culm-swelling of Zizania caduciflora（Turcz.）Hand. -Mazz. during hot summer days.
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Received: 20 December 2012
Published: 01 March 2013
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