Effects of Elevated Atmospheric CO2 Concentration on Grain Filling Dynamics of Different Spike-type Winter Wheat

doi:10.3969/j.issn.1000-6362.2019.05.002

Abstract

Abstract:

The free air CO2 Enrichment (FACE) system was used to study the grain filling dynamics of whole panicles and different positions of wheat panicle in different spike-type cultivars (medium-spike type, cv. Jindong8, large-spike type, cv. Shanhan8675 and multi-panicle type, cv. Triumph) under the elevated CO2 concentration of 550±17μL·L-1 (5：30-18：00) and the ambient CO2 concentration 400±16μL·L-1. The results showed that: (1) the initial grain weight was significantly increased under the elevated CO2 concentration. Elevated CO2 concentration increased the grain weight of Jingdong8 (medium-spike type) in the early grain filling stage with no effect on the final grain weight, and had no effect on the grain filling duration and average filling rate; Elevated CO2 prolonged the grain filling duration of Shanhan8675 (large-spike type) by 19.3% and increased grain weight significantly, the dry weight of the upper, middle and lower parts of the panicle was increased by 11.0%, 20.9% and 23.3%, respectively, and the whole panicle was increased by 18.8%; The Triumph (multi-panicle type) did not show significant increase in grain weight under elevated CO2 concentration, due to the lower grain-filling rate offset the prolonged duration effect to the mass maturity. (2) Regarding of the panicle positions, the elevated CO2 showed a positive effect of the filling parameters (the maximum grain-filling rate, the time reach maximum growth rate, grain filling duration and average grain filling rate) on the upper and lower position of wheat panicle of Jingdong8 and Shanhan8675, contrast with the Triumph’s middle panicle part of panicle. (3) Elevated CO2 shorten the duration of Jindong8 and Shanhan8675 in early grain-filling stage, whereas prolonged the duration of the middle and the last grain-filling stage, which was opposite to the average grain filling rate in the three periods; The grain filling duration of the three stages of Triumph was prolonged, while the average grain filling rate showed the opposite trends. The results suggest that the large-ear type winter wheat will have a better performance than multi-panicle type winter in a CO2-rich world.

Key words: FACE, Winter wheat, Variety, Grain filling

WANG Dong-yan, GUO Li-ping, LI Yu-ting, ZHENG Lei, HAN Xue. Effects of Elevated Atmospheric CO2 Concentration on Grain Filling Dynamics of Different Spike-type Winter Wheat[J]. Chinese Journal of Agrometeorology, 2019, 40(05): 284-292.

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