000			03314nab a22003857a 4500
001			67860
003			MX-TxCIM
005			20250326092057.0
008			240830s1986 -us|||p|op||| 00| 0 eng d
022			_a0011-183X
022			_a1435-0653 (Online)
024	8		_ahttps://doi.org/10.2135/cropsci1986.0011183X002600030031x
040			_aMX-TxCIM
041			_aeng
100			_aSetter, T.L. _96557
245	1	0	_aSugar and starch redistribution in maize in response to shade and ear temperature treatment
260			_aUnited States of America : _bJohn Wiley & Sons, _c1986.
500			_aPeer review
520			_aBased on previous studies, it has been suggested that sugars stored in the maize (Zea mays L.) stem can be exported to growing kernels, and thus contribute to kernel dry matter. The objective of the current study was to determine to what extent sugar and starch depletion from maize (cv. Cornell 175) stem responds to shade and ear temperature treatments. Stem sugar concentrations in pith and vascular bundle tissues of stem remained at stable levels throughout a diurnal time course and after 3 days of canopy shading. In contrast, free space sugar concentrations were lower at 0600 h than at 1800 h (EST). When ear temperatures were controlled at 6, 16, 25, and 32°C from 18 to 27 days after pollination (DAP), plants had similar glucose, sucrose, and starch concentrations in leaf blades and sheaths at all ear temperatures; however, sucrose concentrations in a composite sample of cobs, shanks, and husks (CSHs), and in stems were higher in plants with the 6°C ear temperature than in plants with the 25°C ear temperature treatment. When plants were shaded to exclude 85% of light flux and ear temperatures were controlled during the period from 34 to 44 DAP, sugar and starch concentrations in leaf blades and sheaths were not affected. Glucose, sucrose, and starch concentrations in certain stem fractions were higher in plants with 6°C treatments than in corresponding stem fractions of plants with higher ear temperature. The differences between total sugar content in stems of the 6°C treatment and the contents in stems of the 16, 25, and 32°C treatments were 3.6, 4.1, and 4.1 g/plant, respectively. These differences were not attributed to respiratory loss because, at the end of the treatment period, stem and ear respiration rates among plants with various ear temperatures were not discernibly different. It appears that temperature-induced increases in kernel sink strength at the middle and late kernel-fill stages increase the extent of carbohydrate redistribution from vegetative plant parts to kernels.
546			_aText in English
650		7	_aCarbohydrates _2AGROVOC _94730
650		7	_aStrength _2AGROVOC _925565
650		7	_aZea mays _2AGROVOC _91314
650		7	_aSugar _2AGROVOC _923496
650		7	_aCorn starch _2AGROVOC _926110
650		7	_aMaize _2AGROVOC _91173
650		7	_aKernels _2AGROVOC _91168
650		7	_aDry matter _2AGROVOC _96005
650		7	_aGlucose _2AGROVOC _922525
650		7	_aSucrose _2AGROVOC _911941
650		7	_aHusks _2AGROVOC _918836
700	1		_aFlannigan, B.A. _936690
773	0		_dUnited States of America : John Wiley & Sons, 1986. _gv. 26, no. 3, p. 575-579 _tCrop Science _wG444244 _x0011-183X
942			_2ddc _cJA _n0
999			_c67860 _d67852