Light Response Characteristics of Azadirachta indica Provenances in Different Growing Seasons Within Crowns

ZHENG Yi-xing; PENG Xing-min; WU Jiang-chong; ZHANG Yan-ping

Light responses for net photosynthetic rate of four Azadirachta indica provenances in different growing seasons within crowns were measured with Li-6400 Portable Photosynthesis (Li-Cor Inc., USA).The results showed that light response curves of the four provenances exhibited different characteristics with different aged leaves and positions within the tree crowns. There were obvious differences in the light saturation point (LSP) and light compensation point (LCP) among the four A. indica provenances in different growing seasons. For the same provenance, the LCP of initiation phase was the highest and that of prosperous phase was the lowest. For the seasonal variation of the LSP, there was a trend of initially increasing from initiation phase to prosperous phase, then decreasing in the last phase. Rankings of LCP and LSP in the different layers in the tree crowns were similar, i.e., the upper crown > mid crown >lower crown, which expressed the ecological adaptability to the variant light conditions. Among the four provenances, the maximum net photosynthetic rate of A. indica originating from Kalyani (KA) through the light response measurements was the highest (about 18.95 μmol·m-2·s-1 ), and that of other three provenances was between 13.98-16.35 μmol·m-2·s-1 . According to those photosynthetic characteristics, i.e. the higher LCP and LSP, the stronger adaptability to high light intensity and the higher photosynthetic capacity, the four provenances of A. indica all showed typical heliophyte properties.

1. Research Institute of Resource Insects, Chinese Academy of Forestry, Key Laboratory of Breeding and Utilization of Resource Insects, State Forestry Administration, Kunming 650224, Yunnan, China

Received Date: 2010-10-12

Abstract: Light responses for net photosynthetic rate of four Azadirachta indica provenances in different growing seasons within crowns were measured with Li-6400 Portable Photosynthesis (Li-Cor Inc., USA).The results showed that light response curves of the four provenances exhibited different characteristics with different aged leaves and positions within the tree crowns. There were obvious differences in the light saturation point (LSP) and light compensation point (LCP) among the four A. indica provenances in different growing seasons. For the same provenance, the LCP of initiation phase was the highest and that of prosperous phase was the lowest. For the seasonal variation of the LSP, there was a trend of initially increasing from initiation phase to prosperous phase, then decreasing in the last phase. Rankings of LCP and LSP in the different layers in the tree crowns were similar, i.e., the upper crown > mid crown >lower crown, which expressed the ecological adaptability to the variant light conditions. Among the four provenances, the maximum net photosynthetic rate of A. indica originating from Kalyani (KA) through the light response measurements was the highest (about 18.95 μmol·m-2·s-1 ), and that of other three provenances was between 13.98-16.35 μmol·m-2·s-1 . According to those photosynthetic characteristics, i.e. the higher LCP and LSP, the stronger adaptability to high light intensity and the higher photosynthetic capacity, the four provenances of A. indica all showed typical heliophyte properties.

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Light Response Characteristics of Azadirachta indica Provenances in Different Growing Seasons Within Crowns

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