Chinese Journal OF Rice Science >
Effects of Elevated Atmospheric CO2 and Temperature on Seed Vigor of Rice under Openair Field Conditions
Received date: 2015-12-29
Revised date: 2016-03-12
Online published: 2016-07-10
The increases in atmospheric carbon dioxide concentration and air temperature are two important features of global climate change.The present study was conducted to reveal how rice seed vigor will be affected by these two important environmental factors when rice plants were grown under future environment conditions. By using the rice Free Air CO2 Enrichment(FACE) system, an inbred japonica rice Wuyunjing 23 was grown under four different combinations of CO2 concentration and temperature treatments, i.e. ambient air(Ambient), elevated \[CO2\](EC,Ambient+200 μmol/mol, elevated temperature（ET,Ambient+2℃） and elevated \[CO2\]+elevated temperature(EC+ET). At maturity, seeds were harvested and subjected to the standard germination trial in laboratory. The results indicated that compared with seeds obtained from ambient air, the seeds from EC plants showed higher value (+165%) in the electrical conductivity of deionized water in which seeds have been soaked for 24 hours. However, EC decreased the sprouting rate, germination rate, germination potential and germination index by 7.8%, 10.0%, 17.4%and 8.9%, respectively.The effects of ET and EC+ET on the above parameters followed the similar patterns, but in most cases the effects became smaller and were statistically insignificant. Compared with the ambient temperature, high temperature during growth reduced high CO2effects on the electrical conductivities of seed soaking solution, sprouting rate, germination rate, germination potential and germination index, which was shown by certain degree of interaction between CO2 concentration and temperature. The characteristics of sprout and root of the germinated seed were not changed by CO2 concentration or/and temperature increases during plant growth. The above results indicated that the sprouting rate, germination rate, germination potential and germination index of the seed of inbred japonica rice Wuyunjing 23 were significantly decreased when the seeds were produced in the high CO2 concentration environment. But such negative effects of high CO2 concentration on seed germination capacity of rice might be ameliorated by simultaneously moderate increase of air temperature during plant growth.
Key words： rice; carbon dioxide; air temperature; FACE (Free Air CO2 Enrichment); seed vigor
GAO Houyu1, JING Liquan2, CHEN Long1, JU Jing1, WANG Yunxia1, *, ZHU Jianguo3, YANG Lianxin2, WANG Yulong2 . Effects of Elevated Atmospheric CO2 and Temperature on Seed Vigor of Rice under Openair Field Conditions[J]. Chinese Journal OF Rice Science, 2016 , 30(4) : 371 -379 . DOI: 10.16819/j.1001-7216.2016.5194
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