Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2019, Vol. 40 ›› Issue (6): 1108-1114.DOI: 10.3969/j.issn.1000-2561.2019.06.011

• Phytophysiology and Biochemistry • Previous Articles     Next Articles

The Photosynthesis and Growth Characteristics of Two Sugarcane Cultivars in Different Phosphorus Rate Condition

LI Jin1,DUAN Tingting2,ZHENG Chao1,**(),LIN Zhong1,LIANG Yanqiu1,GAO Yu1,DENG Kai1   

  1. 1. College of Chemistry and Environment Guangdong Ocean University, Zhanjiang, Guangdong 524088, China
    2. College of Agriculture, Guangdong Ocean University, Zhanjiang, Guangdong 524088, China
  • Received:2018-11-30 Revised:2019-02-02 Online:2019-06-25 Published:2019-07-02
  • Contact: ZHENG Chao

Abstract:

The aim was to select phosphorus (P) efficient sugarcane variety and to apply P fertilizer scientifically after investigating the photosynthesis mechanism regulated by phosphorus. Using sugarcane varieties ROC22 and YT236, three levels of P supply were set in the study. The plant height and biomass of ROC22 and YT236 significantly increased with increasing P supply. The plant height of ROC22 was significantly higher than that of YT236 after the plants were cultivated in the nutrient solution for 60 days. The biomass of ROC22 with P application of 1 mmol/L was significantly higher than that of YT236, and the fresh weight and dry weight of ROC22 increased 1.6 fold and 1.4 fold compared to YT236. The total chlorophyll (Chl), net photosynthetic rate (Pn) intercellular CO2 concentration (Ci), transpiration rate (Tr) and stomatal conductance (Gs) of ROC22 significantly increased with increasing P supply. Pn, Ci, Tr and Gs of YT236 with P application of 0.1 and 1 mmol/L were significantly higher than that without P application. Chl of YT236 with P application of 1 mmol/L was significantly higher than that without P application and with 0.1 mmol/L P application. Chl of ROC22 with P application of 0.1 and 1 mmol/L increased by 16% and 14% compared to YT236, respectively. Pn of ROC22 with 3 levels of P supply was significantly higher than that of YT236. Ci of ROC22 with 1 mmol/L P application was significantly higher than that of YT236. Tr and Gs of ROC22 without P application were significantly higher than that of YT236. Considering the photosynthesis and growth of sugarcane, the optimum level of P supply for ROC22 and YT236 was 1 mmol/L. The photosynthesis and growth of ROC22 in the study area was obviously better than that of YT236, so ROC22 was suggested to be planted in the study area and the phosphorus deficiency soil.

Key words: Saccharum officinarum L., biomass, phosphorus, photosynthesis

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