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Noun1.midvein - the vein in the center of a leafmidvein - the vein in the center of a leaf  
nervure, vein - any of the vascular bundles or ribs that form the branching framework of conducting and supporting tissues in a leaf or other plant organ
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Inactivation of a gene encoding carotenoid cleavage dioxygenase (CCD4) leads to carotenoid-based yellow coloration of fruit flesh and leaf midvein in peach.
slender, slightly pubescent when young, soon glabrescent; Leaf blade ovate or sub-rounded to elliptic, 2-5 (7)x 1.502.5 cm, young pubescent, soon abaxially pubescent along midvein, base broadly cuneate to sub-rounded, margin obtusely serrate, serrulate, cuneate, crenate, rarely entire, apex acute or shortly acuminate, lustrous green above and light green below.
leaves involves specific photosynthetic-sourced changes of NADPH/NADP(+) in the midvein.Protoplasma, vol.
Leaf blades 5-20 x 2-3.5(-5 cm), chartaceous, obovate to obovate-elliptic, discolorous, brown abaxially, green adaxially, base acute, apex acute, sometimes rounded, the margin entire, glabrous on both surfaces, with cystolith-like protuberances on both sides, the midvein adaxially raised proximally, plane distally, abaxially raised, secondary veins 6-18 per side, raised abaxially, slightly impressed to plane adaxially, tertiary venation not visible.
The non-existent response of embryogenesis somatic in the leaflet sections was due to the high cell differentiation of veins and leaflet midvein. Some forest species present vascular tissue that favors organogenesis (Vila et al., 2003), due to the transport of endogenous hormones through these conductive tissues (Miriam et al., 2008).
Bracts are thin, 8-15 mm long, 3-15 mm broad, ovate, and expanding to the top, with irregularly toothed margins [4], rudimentary midvein, and parallel veins of similar thickness (Figures 7(a) and 7(b)).
The arrangement of the vascular system in the petiole and the midvein are useful in the diagnosis of some plant species.
Leaves three per node, shortly petioled; petiole 2-3 mm long; lamina widely elliptic, 3.5-6 x 2.3-3.2 cm, fleshy, glabrous on both surfaces, venation obscure especially on the upper surface, formed by a midvein and two pairs of pinnate secondary veins, base decurrent, apex obtuse.
Prickly lettuce can be easily distinguished by the row of spines on the midvein ridge of its leaves.
Detached wounded leaves (three cuts from the margin to the midvein) floated on control media contained 194 +/- 61 ng/g ABA while IAA treated detached wounded leaves contained 385 +/- 111 ng/g ABA.
Thus, if they are not controlled now, they will reappear repeatedly throughout the season.Eggs are laid in slits in the midvein on the upper side of the leaves.
Each petal has a conspicuous but not prominent midvein and several secondary veins parallel to the midvein that dichotomize towards the margin (Fig.