香榧不同叶龄叶片光合能力与氮含量及其分配关系的比较

doi:10.11707/j.1001-7488.20150206

Abstract

Abstract:

【Objective】 To elucidate photosynthetic characteristics and the relationships with leaf nitrogen content and nitrogen allocation in leaves of Torreya grandis at different position and different leaf age, the light response curve, CO₂ response curve, specific leaf weight (SLW), chlorophyll content of apical shoot (A) and side branches (S) leaves at different leaf age were studied. This study aims at providing a theoretical basis for the further development of the high yield cultivation. 【Method】 We measured the light response curve, CO₂ response curve, chlorophyll content, leaf nitrogen content of the current year leaf, one-year-old leaf, two-year-old leaf of different position under natural conditions. 【Result】 The results showed that LSP (light saturation point) and P_max (maximum net photosynthetic rate) decreased with increasing leaf age. We also found that chlorophyll content, leaf nitrogen content per dry weight, the fraction of leaf nitrogen allocated to carboxylation (N_C), the fraction of leaf nitrogen allocated to bioenergetics (N_B), photosynthetic nitrogen utilization efficiency (PNUE) decreased while SLW increased with increasing leaf age. Moreover, a significant negative correlation was observed between PNUE and SLW. However, there were no differences in P_max, Chl content, N_M, N_C, N_B, N_L, PNUE and SLW between the apical shoot and the side branch at the same leaf age. 【Conclusion】 The result indicated that the net photosynthesis rate had distinct differences with the increasing leaf age, which would be mainly due to the differences in Chl, V_cmax, J_max. Compared with the current-year leaves, the relatively older leaves invested more nitrogen to cell walls relative to photosynthetic structure, correlating with leaf toughness, with less nitrogen allocating to N_C, N_B, N_L, causing a decrease in photosynthetic rate and PNUE. There were no differences in photosynthetic characteristics between the apical shoot and the side branch at the same leaf age. This study clarifies the reason for the different photosynthetic characteristics and their relationships with leaf nitrogen content and nitrogen allocation in leaves of different position at different leaf age, which is vital for increasing the fruit production of T. grandis by adjusting material investment, distribution pattern and improving photosynthetic performance.

Key words: Torreya grandis, leaf age, photosynthesis rate, nitrogen, nitrogen allocation

CLC Number:

S718.43

Huang Zengguan, Yu Weiwu, Luo Honghai, Li Yufei, Dai Wensheng, Hu Yuanyuan, Wu Jiasheng. Photosynthetic Characteristics and Their Relationships with Leaf Nitrogen Content and Nitrogen Allocation in Leaves at Different Leaf Age[J]. Scientia Silvae Sinicae, 2015, 51(2): 44-51.

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Photosynthetic Characteristics and Their Relationships with Leaf Nitrogen Content and Nitrogen Allocation in Leaves at Different Leaf Age

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