Study on the Seasonal Variation and Difference on Net Photosynthetic Rate of Slash Pine’s Half-sib .

Abstract

Abstract: The net photosynthetic rate and maximum net photosynthetic rate of slash pine’s half-sib around 1 year is studied utilities of LI-6400 portable photosynthetic system so as to study on the seasonal variation and difference on net photosynthetic rate. The result showed that the seasonal variation of net photosynthetic rate and maximum net photosynthetic rate of slash pine’s half-sib is double range curve. There is no notable difference on net photosynthetic rate among needles with same half-sib. There is notable difference on net photosynthetic rate with same needles among half-sib. The net photosynthetic rate of 1 year needle of half-sib 464 and 609 and 1077 is over than others. The common variety is lowest. The net photosynthetic rate is step by 8.17μmol•m-2•s-1 and 7.91μmol•m-2•s-1 and 7.88μmol•m-2•s-1 and 5.46μmol•m-2•s-1.The net photosynthetic rate of 2 year needle of half-sib 1077 and 609 and 46 is over than others. The common variety is lowest. The net photosynthetic rate is step by 5.47μmol•m-2•s-1 and 5.42μmol•m-2•s-1 and 5.37μmol•m-2•s-1 and 3.65μmol•m-2•s-1.The net photosynthetic rate and maximum net photosynthetic rate of 1 year needle is over than 1 year needle’s. The net photosynthetic rate of 1 year needle decrease by 64.41% against maximum net photosynthetic rate 1 year needle. The net photosynthetic rate of 2 year needle decrease by 54.44% against maximum net photosynthetic rate 2 year needle. The potential of heredity and improvement is very high by breeding on light effective. It can increase growth and yield by adjusting cultivation method.

CLC Number:

S718.43

Tong Fangping, Xu Yanping, Long Yingzhong, Song Qing’an, Yi Aiqin, Li Gui. Study on the Seasonal Variation and Difference on Net Photosynthetic Rate of Slash Pine’s Half-sib .

[J]. Chinese Agricultural Science Bulletin, 2008, 24(7): 419-424.

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