JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2016, Vol. 40 ›› Issue (03): 63-69.doi: 10.3969/j.issn.1000-2006.2016.03.011

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Differences of photosynthetic characteristics based on a mechanistic model of light-response for three herbaceous plants

YAN Xiaohong1,2, ZHOU Bing2, WANG Ning2, YE Zipiao2, YIN Zengfang1*   

  1. 1. College of Biology and Environment, Nanjing Forestry University, Nanjing 210037, China;
    2. School of Life Sciences, Jinggangshan University, Ji'an 343009, China
  • Online:2016-06-18 Published:2016-06-18

Abstract: A mechanistic model of light-response of photosynthesis was used to compare the differences of photosynthetic characteristics for Bidens frondosa, Lactuca indica and Polygonum lapathifolium. The results showed that the electron transport rates of B. frondosa and P. lapathifolium were significantly higher than that of L. indica under middle and high light, and neither appeared photinhibition under high light, whereas L. indica appeared photinhibition significantly. Net photosynthetic rate(Pn)of B. frondosa and P. lapathifolium were higher than that of L.indica under different light intensity. Chlorphyll content of three plants mature leave listed as B. frondosa>P. lapathifolium>L.indica, and P. lapathifolium>B. frondosa>L.indica for carotenoid content. Although chlorphyll content of L. indica was the lowest, its eign-absorption cross-section(σik)was the maximum. On the contrary, chlorphyll content of B. frondosa was the highest, and its σikwas the lowest. Chlorphyll content of P. lapathifolium and σik were between the other two species. The maximum electron transport rates of B. frondosa and P. lapathifolium were significantly higher than that of L. indica, which improved their electron transport rates through increasing the effective light absorption cross-section of photosynthetic pigments(σik')and decreasing the minimum average life time of photosynthetic pigment molecules in the excited state(τmin). Compared with L.indica, B. frondosa and P. lapathifolium had higher the maximal net photosynthetic rate(Pn,max), light saturation point(Isat), and dark respiratory rate(Rd).The higher NPQ of B. frondosa was helpful for thermal dissipation, and avoiding light damage. The higher arotenoid content of P. lapathifolium exerted positive effects on dissipating excess excitation energy, which was contributed to its avoid of the stress damage as high temperatures, high lights and drought. In conclusion, compared with L. indica, B. frondosa and P. lapathifolium might have better tolerance and adaptablity under environmental stress.

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