The Role of Plant Growth Regulators in the Development and Germination of Conifer Pollen

摘要: All classes of PGRs have been identified in pollen and at least implicated its growth development. When added exogenously, their effects on vitro germination tube can be either neutral, promotive or inhibitory. It is generally agreed that play an important role regulating but endogenous levels appear to sufficient significant responses applications are seldom observed. Specific roles conifer not elucitated certain speculations offered. In pines, auxins derived from may the continued development ovule, since unpollinated ovules abort. However, several other genera (Pseudotsuga for example) required continue ovule Gibberellins (GAs) a early stages growth. Both polar non-polar GAs isolated germinating pollen, it which rise decline during time maximum Abscisic acid (ABA) occurs styles ovaries many angiosperm species some conifers does any apparent may, however, incompatibility reactions. Brassinolides studied detail occurrence has confirmed. Cyclic-adenosine monophosphate (cAMP) considered PGR mimic studies. discussed relationship media dramatic influence explain lack response cases.