Sugarcane Leaf Photosynthetic CO2 Responses Parameters and Their Difference among Varieties

doi:10.3969/j.issn.1000-6362.2019.10.004

Abstract

Abstract: Sugarcane (Saccharum officinarum L.)photosynthetic CO2 response represents an important physiological characteristic for sugarcane growth. Sugarcane is the major sugar crop, exhibiting the characteristic of higher photosynthetic efficiency as a C4 plant. This study was conducted to compare performance of different models of photosynthetic CO2 response, and to investigate the photosynthetic CO2 response characteristics of different sugarcane varieties. Field measurements were carried out in Kaiyuan, Yunnan Province, using a portable LI-6400XT photosynthesis system to explore the correlation between the photosynthetic CO2 response parameters. The non-rectangular hyperbola model (NRH), rectangular hyperbola model (RH) and Ye model were used to fit the sugarcane photosynthetic CO2 response curve of six varieties, and the photosynthetic CO2 response parameters were analyzed. The results showed that the photosynthetic CO2 response curve fitted by NRH and RH model do not determine CO2 saturation point (CSP), and overestimate the maximum net photosynthetic rate (Amax). The initial carboxylation rate (η) fitted by NRH model were almost the same as the measured values, but the respiration rate (Rp) and CO2 compensation point (CCP) fitted by NRH model were both negative. In general, the Ye model was the best in simulating the photosynthetic CO2 response curves. In the photosynthetic CO2 response parameters fitted by Ye model, η was significantly correlated (positively) with Rp/CCP (P<0.001), Rp was significantly correlated (positively) with η and CCP (P<0.05), η and Rp were significantly correlated (negatively) with CSP (P<0.05). The varieties with higher photosynthetic rate under low CO2 concentration tended to have higher respiration rate, meanwhile, they have lower photosynthesis capacity under high CO2 concentration, which are easier to reach CO2 saturation point. The average Amax value of six sugarcane varieties fitted by Ye model was 32.44.5mol·m-2·s-1, η was 0.1280.060, CSP was 115277mol·m-2·s-1 and CCP was 8.55.5045mol·m-2·s-1. ROC22 had lower Rp, and CCP and the highest Amax, indicating the most realistic to represent photosynthetic characteristics. All the five sugarcane varieties except YZ99-91 have large CSP, and could adapt to the increasing CO2 concentration in the atmosphere.

Key words: Sugarcane, Photosynthetic CO2 response, Ye model, Varieties, Photosynthetic CO2 response parameters

LIU Yang-yang, LI Jun, YU Qiang, LIU Shao-chun, TONG Xiao-juan, YU Ling-xiang. Sugarcane Leaf Photosynthetic CO2 Responses Parameters and Their Difference among Varieties[J]. Chinese Journal of Agrometeorology, 2019, 40(10): 637-646.

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