Research involving plant growth regulators (PGRs) and orchids in areas of orchid growth and development are reviewed . For all areas covered in the review -seed germination and seedling growth, lateral shoot production, root production, flower initiation and development, postharvest physiology, and photosynthate partitioning -it was concluded that further studies would assist in clarifying potential uses for PGRs in the orchid cut-flower industry . It is suggested that extra PGR research on orchids is justified at the present time because of favourable prospects facing the orchid cut-flower industry .
Abstract. Ethylene production during geostimulation was examined in peduncles of dandelion (Taraxacum officinale). Significant amounts of ethylene were evolved from geostimulated peduncles compared with vertical controls only after geostimulation of 2 h or longer and the extra ethylene arose mainly from the lower portion of geostimulated peduncles. Reduction of the ethylene produced from geostimulated peduncles by pretreatment with ethylene‐synthesis inhibitors did not affect or enhanced subsequent geobending. It is proposed that ethylene may control the later stages of geobending and influence the straightening process of autotropism.
A series of glasshouse and growth-cabinet experiments were carried out to investigate aspects of flower and pod production in Phaseolus vulgaris L. (French bean). Abscission of flowers and immature pods varied between 45 and 80 % in the seven cultivars tested, with flowers which opened first being most likely to produce mature pods. Seed yield was only slightly reduced and sometimes increased by the removal of opened flowers for periods of up to 15 days from the start of anthesis depending on the conditions under which plants are grown. It was demonstrated that plants compensated for flower removal by setting pods from flowers which opened later. Similarly, when opened flowers were removed from alternate nodes plants compensated by setting pods from flowers which opened on nodes not being deflowered.The physiological basis for premature abscission of reproductive structures in grain legumes is discussed.
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