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GrainGenes Reference Report: CRC-32-233

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Reference	CRC-32-233
Title	Effects of high atmospheric CO SUB 2 on the morphological and heading characteristics of winter wheat
Journal	Cereal Research Communications
Year	2004
Volume	32
Pages	233-240
Author	Bencze S Veisz O Bedo Z
Abstract	Two winter wheat cultivars (Mv Martina and Mv Emma) were grown in growth chambers under controlled environmental conditions at ambient (control) and doubled atmospheric CO SUB 2 concentrations (375 and 750 micromol mol SUP -1 ). By heading, the plants of both cultivars were taller in the doubled CO SUB 2 treatment, where among all the vegetal parts the largest increase (31-67%) was observed in the stem weight. The plants had higher aboveground biomass at high CO SUB 2 than at the ambient level, and also more spikes were found in both cultivars at harvest, due to either increased tiller production with similar heading efficiency to the control, or a more modest rise in the tiller number accompanied by improved heading efficiency resulting in 19% fewer sterile tillers. As there were no significant changes in the number of grains and the grain weight per spike at elevated CO SUB 2 , the increase in the yield could only be attributed to the increase in the spike number, though in one variety it remained below the level of significance. Heading started later at elevated CO SUB 2 , as the plants produced the main spike 1.5-3.5 days later than in the control. However, the plants of one cultivar produced the second spike much faster (2.7 days after the main spike, compared to 5.1 in the control) at high CO SUB 2 than the other, while in the other cultivar the subsequent spikes appeared in a similar chronological order to the ambient CO SUB 2 level. These findings imply that, despite the delaying impact of high CO SUB 2 on the heading date, the plants might compensate by the faster production of further spikes, leading to a synchronization of spike emergence
Keyword	agricultural research [ Show all 19 ]

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