Chinese Journal OF Rice Science >
Effects of Elevated Atmospheric CO2 and Temperature on Dynamics of Leaf Chlorophyll Contents and SPAD Value of Rice in Open-Air Field Conditions
Received date: 2017-02-14
Revised date: 2017-04-13
Online published: 2017-09-10
【Objcetive】In view of the potential impacts of increasing atmospheric carbon dioxide (CO2) concentration and air temperature, the dynamic effects of these two important environmental factors and their interaction on leaf chlorophyll contents and SPAD values of rice in field were studied.【Method】 By using T-FACE(Temperature-Free Air CO2 Enrichment) facility, a high yield and excellent-quality japonica rice (Oryza sativa L.) Wuyunjing 23 was grown at two levels of CO2 (ambient and elevated CO2 concentration) and two temperature regimes (ambient and elevated temperature) in a field experiment. We measured leaf chlorophyll contents and SPAD values during the whole growth period of rice plants.【Result】Elevated CO2 concentration increased chlorophyll a, b, a+b contents of rice on 41, 77 and 94 days after transplanting (DAT) , with the maximum increase of 6.4%. On the contrary, they were decreased by elevated CO2 concentration on 110 and 119 DAT, with the maximum decrease of 5.4%. Due to the greater responses of chlorophyll b to CO2 concentration than that of chlorophyll a, elevated CO2 concentration decreased chlorophyll a/b ratio on 41, 77 and 94 DAT by 4.7%, 2.3% and 0.9%, but increased it on 110 and 119 DAT by 1.9% and 5.3%, respectively. No obvious effect of elevated CO2 concentration on leaf SPAD values was detected in the early and middle growth stages. But elevated CO2 concentration decreased leaf SPAD values by 3.5% (P=0.1) and 19.1% (P<0.01) on 110 and 119 DAT. 1℃increase in temperature on average had positive effects on chlorophyll a, b, a+b contents in each growth stage of rice, but negative effects were found on chlorophyll a/b ratio. In general, the magnitudes of variation induced by temperature were less than those by elevated CO2 concentration. No obvious effect of temperature elevation on leaf SPAD values was detected in the early and middle growth stages. But temperature elevation deceased leaf SPAD values by 7.1% (P<0.01) and 14.8% (P<0.01) on 110 and 119 DAT, respectively. No CO2-temperature interaction was detected for most of measured parameters, but significant CO2- or temperature-growth stage interactions were found.【Conclusion】The results indicated that elevated CO2 concentration favored the leaf chlorophyll formation of rice in the early and middle growth stages. But in the late growth stage, leaf chlorophyll contents and SPAD value declined, meanwhile chlorophyll a/b ration increased significantly. Such phenomenon of quick-leaf-senescence induced by elevated CO2 concentration was identical under the two temperature regimes.
Ning ZHOU, Liquan JING, Yunxia WANG, Jianguo ZHU, Lianxin YANG, Yulong WANG . Effects of Elevated Atmospheric CO2 and Temperature on Dynamics of Leaf Chlorophyll Contents and SPAD Value of Rice in Open-Air Field Conditions[J]. Chinese Journal OF Rice Science, 2017 , 31(5) : 524 -532 . DOI: 10.16819/j.1001-7216.2017.7022
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