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Canopy development and tillering of field‐grown crops of two contrasting cultivars of winter wheat (Triticum aestivum) in response to CO 2 and temperature
Author(s) -
BATTS G R,
ELLIS R H,
MORISON J I L,
HADLEY P.
Publication year - 1998
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1998.tb05806.x
Subject(s) - interception , cultivar , canopy , biology , agronomy , sowing , winter wheat , field experiment , horticulture , botany , ecology
Summary. Elevated CO 2 (691 cf. 371 /miol CO 2 mol ‐1 air) and warmer temperatures (over the range 1.0 U C below to 1.6 o C above ambient) increased light interception by crops of two contrasting cultivars (Hereward and Soissons) of winter wheat (Triticum aestivum L.) during winter growth in the field. The fractional interception of light by the canopy increased more rapidly initially in Soissons than in Hereward, but Hereward showed a much greater response to CO 2 (35% increase in Hereward but only 7% in Soissons) at 500 o Cd after sowing. By terminal spikelet formation, in contrast, fractional interception was greater in Hereward than in Soissons, while the effect of CO 2 was the same in both cultivars (9%). Thus, although differences in the relative response of canopy development to CO 2 were detected between cultivars initially, differences were negligible during later development. The greater interception of light by the canopy in elevated CO 2 , at any one temperature, resulted from increased tillering. The number of tillers plant“‘ at terminal spikelet was a linear function of main stem dry mass at this developmental stage but with a greater response in elevated CO 2 , viz 2.3 and 3.8 tillers g ‐1 main stem dry mass at 371 and 691 /μmol CO 2 mol ‐1 air, respectively; these relations were unaffected by cultivar.