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植物科学学报 2011
Observation and Genesis Analysis of Vascular Tissue in Cowpea'' s Helix Stem
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Abstract:
Cowpea stems can be right-handed helical when twinning on backers.We found that vascular bundles in skinless stems,which had being soaked in water,ranked lengthways as left-handed helixes,opposite to the stems ' twinning direction.In addition,helix and line type stem internode vessel elements were arranged as sectors when observed in crosswise transection by hand-held slicing method,and the angles of these sectors in helix type stems were significantly less than those in the same internodes of line type ste...
