A comparative study of photosynthetic characteristics between Pennisetum purpureum × P.americanum cv. Reyan No.4 and Miscanthus floridulus

GAO Ruifang; LI Chunjiang; QIN Tiantian; ZHANG Jianguo

doi:10.7671/j.issn.1001-411X.2015.02.010

Journal of South China Agricultural University > 2015 > 36(2): 55-60. > DOI: 10.7671/j.issn.1001-411X.2015.02.010

GAO Ruifang, LI Chunjiang, QIN Tiantian, ZHANG Jianguo. A comparative study of photosynthetic characteristics between Pennisetum purpureum × P.americanum cv. Reyan No.4 and Miscanthus floridulus[J]. Journal of South China Agricultural University, 2015, 36(2): 55-60. DOI: 10.7671/j.issn.1001-411X.2015.02.010

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A comparative study of photosynthetic characteristics between Pennisetum purpureum × P.americanum cv. Reyan No.4 and Miscanthus floridulus

College of Agriculture, South China Agricultural University/Key Laboratory of Energy Plant Resources and Utilization, Ministry of Agriculture, P. R. China, Guangzhou 510642, China

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Received Date: December 07, 2013
Available Online: May 17, 2023

Graphical Abstract

Abstract

Abstract

Objective
The purpose of this study was to obtain high quality raw materials for producing biofuels.
Method
Diurnal variation of photosynthetic characteristics of Pennisetum purpureum×P. americanum cv. Reyan No.4 and Miscanthus floridulus was studied and the correlation between net photosynthetic rate and major impact factors was analyzed using the LI-6400 portable photosynthesis analyzer in the field.
Result and conclusion
The results showed that diurnal variation of the net photosynthetic rate (Pn) of 'Reyan No.4' and M. floridulus showed a "single peak", with no "midday depression" phenomenon. Pn of 'Reyan No.4' (25.45 μmol·m^-2·s^-1) was slightly higher than that of M. floridulus (25.08 μmol·m^-2·s^-1). Transpiration rate (Tr), water use efficiency (WUE), light use efficiency (LUE) and stomatal conductance (Gs) were similar to Pn and reached the maximum at about 13:00. Tr, LUE and Gs of 'Reyan No.4' were slightly higher than those of M. floridulus. Diurnal variation of stomatal limitation value (Ls) for both grasses was bell-shaped, reaching the highest value (0.86 μmol·m^-2·s^-1) at about 11:00 and the lowest in the early morning and late afternoon, but diurnal variation of intercellular CO₂ mole fraction (x_i) was the opposite. Pn of two grasses was negatively correlated with atmospheric CO₂ mole fraction (x_a) (P < 0.05), and positively correlated with relative air humidity (RH) and Gs (P < 0.05), respectively. These results indicate 'Reyan No.4' has a stronger photosynthetic capacity than M. floridulus.

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A comparative study of photosynthetic characteristics between Pennisetum purpureum × P.americanum cv. Reyan No.4 and Miscanthus floridulus

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