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Relationships of Leaf Color and Pigment and Nutrient Elements in Senescing Leaves of Sassafras tsumu

  • Received Date: 2015-11-16
  • [Objective] To study the changes of leaf color, pigment and nutrition concentrations of Sassafras tsumu from the perspective of leaf senescence so as to provide a scientific basis for breeding and cultivation of S. tsumu.[Method] Thirty S. tsumu trees planted under the same environment were tested. From leaf stopping growth to falling off, it can be divided into five periods to observe the leaf color, pigment content and nutrient element content.[Result] The value of leaf color, pigment and nutrition concentrations in S. tsumu showed highly significant difference from earlier period to late period. They were downtrend when the leaf of S.tsumu in autumn. However, the anthocyanin content increased gradually. The content of N, P, and K decreased gradually in the senescing leaf of S. tsumu. In accordance with the canonical correlation analysis, the leaf color a* value showed a significantly negative correlation with chlorophyll content, but showed a significantly positive correlation with the anthocyanin content. The anthocyanin content was inversely proportional to nitrogen content while the carotenoid content was proportional to the content of phosphorus. The symbol of nitrogen resorption efficiency and nitrogen concentrations were opposite. However, the symbol of proportional resorption efficiency and proportional concentrations were the same. The process of S. tsumu leaf senescence included 3 phases. The first phase was from late September to early November in which the leaf commences growing old.The second phase was from late October to early November in which leaf senescence was in plateau. The third phase, i.e. final phase, was from late November to the defoliation.[Conclusion] The best ornamental period of S. tsumu was from late October to early November in which leaf senescence was in plateau. The chlorophyll and carotenoid were decomposed and the anthocyanin was synthesized from the first phase to the third phase. The nitrogen resorption efficiency was lower when the nitrogen concentration was higher. On the contrary, the proportional concentrations had significantly positively correlation with the proportional resorption efficiency.
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Relationships of Leaf Color and Pigment and Nutrient Elements in Senescing Leaves of Sassafras tsumu

  • 1. Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou 311400, Zhejiang, China

Abstract: [Objective] To study the changes of leaf color, pigment and nutrition concentrations of Sassafras tsumu from the perspective of leaf senescence so as to provide a scientific basis for breeding and cultivation of S. tsumu.[Method] Thirty S. tsumu trees planted under the same environment were tested. From leaf stopping growth to falling off, it can be divided into five periods to observe the leaf color, pigment content and nutrient element content.[Result] The value of leaf color, pigment and nutrition concentrations in S. tsumu showed highly significant difference from earlier period to late period. They were downtrend when the leaf of S.tsumu in autumn. However, the anthocyanin content increased gradually. The content of N, P, and K decreased gradually in the senescing leaf of S. tsumu. In accordance with the canonical correlation analysis, the leaf color a* value showed a significantly negative correlation with chlorophyll content, but showed a significantly positive correlation with the anthocyanin content. The anthocyanin content was inversely proportional to nitrogen content while the carotenoid content was proportional to the content of phosphorus. The symbol of nitrogen resorption efficiency and nitrogen concentrations were opposite. However, the symbol of proportional resorption efficiency and proportional concentrations were the same. The process of S. tsumu leaf senescence included 3 phases. The first phase was from late September to early November in which the leaf commences growing old.The second phase was from late October to early November in which leaf senescence was in plateau. The third phase, i.e. final phase, was from late November to the defoliation.[Conclusion] The best ornamental period of S. tsumu was from late October to early November in which leaf senescence was in plateau. The chlorophyll and carotenoid were decomposed and the anthocyanin was synthesized from the first phase to the third phase. The nitrogen resorption efficiency was lower when the nitrogen concentration was higher. On the contrary, the proportional concentrations had significantly positively correlation with the proportional resorption efficiency.

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