000			02570nab a22002657a 4500
001			G97274
003			MX-TxCIM
005			20170719155451.0
008			121211b |||p||p||||||| |z||| |
040			_aMX-TxCIM
041	0		_aEn
100	1		_aWeyhrich, R.A.
245	0	0	_aPhotosynthesis and water-use efficiency of awned and awnletted near-isogenic lines of hard red winter wheat
260			_c1995
500			_aPeer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0011-183X
520			_aAwned hard red winter wheat (HRWW, ,Triticutn aestivum L.) cultivars have prevailed in the Great Plains since the introduction of ?Turkey? wheat in the 1870s, but the role of awns in wheat productivity is unclear. Awns may serve a photosynthetic function during periods of drought stress, and may actually compensate for flag leaf photosynthesis reduced by drought stress. Our objectives were to determine the effect of genetic awn suppression on photosynthesis and instantaneons or season-long measurements of water-use efficiency (WUE), and to monitor associated changes in kernel characteristics. Plants of awned and awnletted near-isogenic lines of three contemporary HRWW cnitivars (TAM 107, Century, and Mustang) were grown controlled-environment chambers under well-watered and waterdeficit conditions. Photosynthetic rates of spikes and flag leaves were measured separately at two stages of kernel development. Whole-plant and grain WUE were measured based on actual water use. Under well-watered conditions, net photosynthetic rates of awnletted spikes were significantly lower than awned spikes for all cnitivars at 1~1 d after anthesis (DAA) and for two cultivars at 24 DAA. Under water-deficit conditions, rates were significantly lower for awnletted spikes of Mustang and TAM 107 at 14 DAA, while no differences were found at 24 DAA. No differences were found between isolines for flag leaf photosynthesis at either stage. Generally, differences in kernel characteristics were nonsignificant between awned and awnletted lines. Although some instantaneous photosynthetic measurements suggested higher WUE of awned spikes, this difference did not result in higher WIrE based on whole-plant biomass or grain weight for awned isolines.
546			_aEnglish
591			_aCrop Science Society of America (CSSA)
593			_aCarelia Juarez
595			_aRPC
700	1		_aCarver, B.F., _ecoaut.
700	1		_aMartin, B.C., _ecoaut.
773	0		_tCrop Science _gv. 35, no. 1, p. 172-176
942			_cJA
999			_c29593 _d29593