The photosynthetic efficiency of some elite rice hybrids and restorers

• Published in: Photosynthetica Vol. 35; no. 2; pp. 241 - 246
• Main Authors: Baig, M.J, Swain, P, Murty, K.S. (Central Rice Research Inst., Cuttack (India))
• Format: Journal Article
• Language: English
• Published: 01.01.1998
• Subjects: ETAPAS DE DESARROLLO DE LA PLANTA; F1 HYBRIDS; FOTOSINTESIS; HETEROSIS; HIBRIDOS F1; HIGH YIELDING VARIETIES; HYBRIDE F1; LEAF AREA; ORYZA SATIVA; PADRES; PARENT; PARENTS; PHOTOSYNTHESE; PHOTOSYNTHESIS; PLANT DEVELOPMENTAL STAGES; RESPIRATION RATE; STADE DE DEVELOPPEMENT VEGETAL; SUPERFICIE FOLIAR; SURFACE FOLIAIRE; TASA DE RESPIRACION; TAUX DE RESPIRATION; VARIEDADES DE ALTO RENDIMIENTO; VARIETE A HAUT RENDEMENT; VIGOR HIBRIDO; VIGUEUR HYBRIDE
• ISSN: 0300-3604; 1573-9058
• DOI: 10.1023/A:1006962807448

At the vegetative growth stage (40 d), the mean photosynthetic rate (PN) and canopy photosynthesis (PN x LAI) in F1 hybrids and their parents were similar, whereas the maintenance respiration rate (RM) was considerably higher and PN/RM lower in the F1 hybrids than in the parents. Yet at the flowering stage, the hybrids showed higher PN and PN x LAI values, while RM and PN/RM were similar in both. A specific F1 hybrid like IR 62829A x Vajram showed high readings in PN, PN/RM, and PN x LAI at the flowering stage, while IR 62829A x Swarna followed by IR 62829A x Vajram had high values 40 d after planting. The parents Swarna and Vajram, although moderate in PN, had the highest PN x LAI at the flowering stage due to a greater LAI.