ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Why study plant growth substances in subtropical crops?

Cutting, J. G. M., Bower, J. P. and Bangert, F.

Acta Horticulturae Year: 1990 Issue: No. 275 Pages: 477-482 Ref: 24 ref.

1990

บทคัดย่อ

Reasons for the difference between expectation of and the achievement of plant growth regulators to solve agricultural problems are discussed. Two examples where research into plant growth regulation has helped to solve problems are presented. Browning of avocado is an important postharvest disorder. Abscisic acid (ABA) levels were measured in fruits at different ripening times and from 3 irrigation regimes. ABA increased with increasing water stress. Different long term storage conditions designed to reduce postharvest stress showed that controlled atmosphere, CO2 shock and high humidity treatments gave fruits of higher quality than normal cold storage. Many fruit disorders are related to availability and supply of Ca which has shown to be influenced by the polar basipetal auxin transport system. The disruption of IAA transport either by chemical or physiological means leads to severe Ca deficiency symptoms. Conversely the growth regulator PIX (mepiquat chloride) seems to increase Ca levels in Citrus and has shown to increase IAA levels in tomato and apple. It is believed that this could be another way to improve postharvest fruit quality.