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Synchronism of leaf development between main stem and tillers has a strong influence on tillers surviving, mainly on early stages plant cycle in rice. Leaf development in rice cultivar 'IRGA 417' was studied to identify synchronism between tillers and main stem on early vegetative period using the growth stages as proposed by HAUN (1973). Plants were grown in hydroponic system until the main stem eighth leaf (22 days after transplant). First leaf appearance of each primary tiller was delayed and almost coincided with the emergence of second leaf. First and second tillers appearance were concomitant and began when the plants were on the stage 3.9 (HAUN, 1973). Third and fourth tillers appeared later when the plants were, on average, on stage 6.0 and 7.0 (HAUN, 1973), respectively. Synchronism, characterized by the difference between number of leaves of main stem and tillers, occurred despite the late emergence of the tillers' first leaf, and the percentage of synchronized tillers increased along with the main stem leaf development.

Desenvolvimento foliar e sincronismo dos afilhos na cultivar de arroz 'IRGA 417'