کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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2179777 | 1095079 | 2012 | 6 صفحه PDF | دانلود رایگان |
The morphology, anatomy and vasculature of Pinus leaves was studied. The results indicate that the Pinus leaf is always supplied with only one single vascular bundle, which is surrounded by a prominent bundle sheath. In several taxa, especially of subgenus Pinus, the vascular bundle may however be subdivided by longitudinal parenchymatic bands in the middle part of the leaf. As a result, the single bundle gets the appearance of two individual bundles, which are surrounded by a common bundle sheath. The general rule that a bundle sheath does sheath only one single bundle, as in other gymno- and angiospermous seed plants, applies therefore also for Pinus. The morphological and anatomical similarities between cladodes of Sciadopitys (Sciadopityaceae) and Pinus leaves are based on a completely different bauplan. The idea of “hidden cladodes” in some Pinaceae is therefore obsolete.
Journal: Flora - Morphology, Distribution, Functional Ecology of Plants - Volume 207, Issue 1, January 2012, Pages 57–62