Gnetales


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Related to Gnetales: gnetum, Ginkgoales

Gnetales

[nə′tā·lēz]
(botany)
A monogeneric order of the subdivision Gneticae; most species are lianas with opposite, oval, entire-margined leaves.
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Rays in conifers (other than Gnetales) are rarely more than one cell in thickness (Fig.
The inclusion of data from Gnetales is important to our understanding of hydraulics in conifers and angiosperms.
The search for flower homeotic gene homologs in basal Angiosperms and Gnetales: A potential new source of data on the evolutionary origin of flowers.
Molecular data from the chloroplast rpoC1 gene suggests a deep and distinct dichotomy of contemporary spermatophytes into two monophyla: gymnosperms (including Gnetales) and angiosperms.
gnemon is compared explicitly to the plesiomorphic developmental patterns expressed in the female gametophytes of basal extant seed plants (cycads and Ginkgo) and to Ephedra, which is basal within Gnetales [ILLUSTRATION FOR FIGURE 1 OMITTED].
This requires clear estimation of the phylogenetic position of Gnetum within the Gnetales and more global hypotheses of the relationships of Gnetales to other groups of seed plants [ILLUSTRATION FOR FIGURE 1 OMITTED].
We expected to find acid phosphatase in the drop, since two different laboratories have reported its presence via activity assays in Gnetales. Ziegler (1959) detected it in the nucellus of E.
However studies of the distantly related Gnetales may not benefit to as a large degree compared to those of conifers.
Certainly this seems to be the situation in extant Gnetales (Fig.
Systematics of Gnetales: A review of morphological and molecular evidence.
Li (Chuang & Hu, 1965), the lowest chromosome number ever reported in the gymnosperms (chromosome number n = 7 is frequent in the Gnetales).