Changes in free IAA level in the leaves of short-and long-day tobacco during flowering and the effect of applied IAA on the transition to flowering.

Autor: Lozhnikova, Veronika N.
Další autoři:
Krekule, Jan, 1931-2022
Jazyk: angličtina
Předmět:
Druh dokumentu: Non-fiction
ISSN: 0006-3134
Abstrakt: Abstract: Changes in free IAA level were studied in the leaves of the central stem zone of short-day tobacco (Mcotianatabacum, cv. Maryland Mammoth) and long-day tobacco (Nicotiana silvestris) in inductive photoperiodic regime after 10, 20, 30 and 40 d, respectively. The leaves of SD tobacco Mammoth showed a high free IAA level in vegetative plants kept under long days but it significantly decreased (by ca. 50 %) after 10, 30 and 40 short days, respectively. After 20 short days the IAA level was as high as in the leaves of plants at the beginning of inductive treatment. The changes of freeIAA level in the leaves of LD tobacco N.silvestris were similar to those of SD Mammoth, but the IAA level in this species was significantly lower than that of Mammoth throughout the investigated period. Consequently, the changes observed in N. silvestris were much less pronounced. Plants of both tobacco species were fully induced to flowering by 30 inductive days and this was associated with differentiation of the flower organs. Application of 10 -4 M IAA during the last 10 d of the inductive treatment of 30 d significantly reduced flowering in SD tobacco Mammoth without changing the stem length and apex width. Apex length was slightly reduced. IAA application elicited almost no effect in N. silvestris. The results are discussed with respect to the possible role of IAA in flower induction in SD and LD plants.
Databáze: Katalog Knihovny AV ČR
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