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DOI	10.1016/j.flora.2019.151420
	Xylem conductivities in grasses
	Evans, Lance S.; Ortega, Humberto
通讯作者	Evans, Lance S.
来源期刊	FLORA
ISSN	0367-2530
EISSN	1618-0585
出版年	2019
卷号	257
英文摘要	Grasses are a main source of carbohydrates for the human populations worldwide. Grasses grow in a variety of environments, from wet rice paddies in Asia to deserts with limited water. Research on water distribution characteristics of grass culms to leaves is important because grasses occur in many habitats and circumstances. The purpose of this study is to understand the characteristics of xylem cells (water-transporting cells), xylem cells within vascular bundles, and xylem conductivity. Xylem conductivity is used to estimate the ability of cells to transport water from culms (stems) to leaf lamina. Data from 12 species of C-3 grasses, species mostly confined to temperate climates, and 13 species of C-4 grass, species found in tropical climates, were obtained with standard histological procedures. C-4 grass culms had twice as many vascular bundles as C-3 grasses. Xylem conductivities in culms were two to three times greater for C-4 than C-3 grasses. Xylem conductivities in leaves were five to six times greater for C-4 than C-3 grasses. Xylem conductivities of culms to leaf lamina of C-4 and C-3 grasses species were compared. Leaf conductivities per bundle, relative to culm conductivities per bundle, were almost five times greater for C-4 than for C-3 grasses. In a similar manner, xylem conductivities in entire leaves, relative to xylem conductivities of entire culms, were two times greater for C-4 than for C-3 grasses. Overall, the data show that xylem conductivities were higher in both leaves and culms of C-4 grasses compared with C-3 grasses, and that the contribution of xylem conductivities from culms to leaves were greater for C-4 than for C-3 grasses. The higher conductivities in C-4 grasses was attributed to higher numbers of bundles per culm/per leaf and not to vessel radii or numbers of vessels per bundle.
英文关键词	C-3/C(4)culm and leaf bundles Grasses Xylem radii Xylem conductivity
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000477674200012
WOS关键词	C-4 PHOTOSYNTHESIS ; HYDRAULIC ARCHITECTURE ; LEAF VASCULATURE ; WHEAT LEAVES ; MURRAYS LAW ; EVOLUTION ; VEIN ; CO2 ; TRANSPORT ; CAPACITY
WOS类目	Plant Sciences ; Ecology
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215649
作者单位	Manhattan Coll, Lab Plant Morphogenesis, Biol Sci Res Labs, The Bronx, NY 10471 USA
推荐引用方式 GB/T 7714	Evans, Lance S.,Ortega, Humberto. Xylem conductivities in grasses[J],2019,257.
APA	Evans, Lance S.,&Ortega, Humberto.(2019).Xylem conductivities in grasses.FLORA,257.
MLA	Evans, Lance S.,et al."Xylem conductivities in grasses".FLORA 257(2019).