Способы формирования устьичных аппаратов на листьях Dracocephalum ruyschiana Linn. и D. thymiflorum Linn (Lamiaceae; Dicotyledonae)статья
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Аннотация:DEVELOPMENTAL PATTERNS OF LEAF STOMATAL COMPLEXES IN DRACOCEPIfALUM RUYSCIIIANA LINN. AND D. THYMIFLORUM LINN. (LAMIACEAE; DICOTYLEDONAE)
Developmental patterns of the leaf stomatal complexes are similar in the both Dracocephalum species. The basic pathway of stomatal development (stomatal chreod) is represented by a set of three successive cell divisions. The division of the stomatal initial gives rise to the first subsidiary and primary meristemoid. The latter divides into the second subsidiary and secondary meristemoid. Both divisions are unequal and parallel to each other. Thus, the secondary meristemoid neighborhood is 2. This meristemoid transforms into a guard cell mother cell. It divides equally at the right angle to the previous divisions and produces a pair of guard cells. Thus, typical diacytic stomata arise. However, the stomatal chreod incarnation depends on the local conditions, under which the stomate develops. Therefore 5 to 6% of primary meristemoids divide obliquely increasing the secondary meristemoid neighborhood to 3. This does not affect the subsequent stomatal development but tricytic stomata eventually arise. On the contrary, the secondary meristemoid size does affect the stomatal development. If the secondary meristemoid exceeds 31 mcm2 in area, it is no longer able to transform into a guard cell mother cell. Thus, it divides unequally to produce the third subsidiary and tertiary meristemoid. Only the latter can give rise to guard cells. Since all epidermal cells enlarge during the leaf growth, the stomatal development undergoes regular changes during the leaf ontogenesis.