31 May Phyllochron Dynamics in Rice (Oryza sativa L.)
चावल में फाइलोक्रोन गतिशीलता (ओरिज़ा सातिवा एल.) Phyllochron, defined as the interval time between appearances of successive leaves on a shoot, is an important measurement to know the developmental state of a shoot apex in rice. Shoot development of rice was divided into three stages, regardless of environment and genotype: Maintenance of short phyllochron in the early developmental stage Drastic increase of phyllochron depending on leaf number from the base in the late stage and Decrease of phyllochron before final leaf stage. Origin The modeling of the phyllochron was first published in 1951 when Katayama presented the growth rules, he had worked out for leaf emergence on the main stem and tillers of rice, wheat and barley. The numbers of tillers that emerged from the main tiller and subsequent tillers according to respective tiller orders (main, primary, secondary and tertiary) reflecting their sequence of emergences. The number of total tillers and tertiary tillers increased ex-potentially as the number of phyllochrons (often referred to as leaf number) advanced. It was the growth in number of tertiary tillers that drove the total number up so sharply. Production of tillers in rice The number of primary and secondary tillers increased more linearly with the advance of phyllochrons (the number of periods of tiller emergence). The first primary tiller emerges from the main...