Seed germination rate and associated characters in rice

• Published in: Crop science Vol. 29
• Main Authors: Krishnasamy V, Seshu D.V
• Format: Journal Article
• Language: English
• Published: 01.07.1989
• Subjects: absorcion; absorption; acide amine; actividad enzimatica; activite enzymatique; aging; agronomic characters; amino acids; aminoacidos; azucares; caractere agronomique; caracteristicas agronomicas; energia; energie; energy; ensemencement; envejecimiento; environmental temperature; enzymic activity; faculte germinative; germinability; germinacion; germination; graine; oryza sativa; oxidoreductases; oxidorreductasas; oxigeno; oxydoreductase; oxygen; oxygene; poder germinativo; privacion del agua; privation d' eau; seed; seeds; semence; semilla; semillas; siembra; sowing; stress; sucres; sugars; temperatura del medio ambiente; temperature ambiante; variedades; variete; varieties; vieillissement; water deprivation
• ISSN: 0011-183X; 1435-0653
• DOI: 10.2135/cropsci1989.0011183x002900040012x

Rapid seed germination will facilitate quick plant stand establishment in direct sown rice (Oryza sativa L.) culture. Sixty-eight rice cultivars were grown in the field and in the phytotron, and the harvested seed evaluated for germination rate. Cultivars 'Laxmi', TNAU(AD)103, IR25924-92-1-3, 'IR50', PND160-2-1, RNR1429, IR31779-19-3-3-2-2, and B3981c-Pn-165-2-1 produced seeds in the field and the phytotron that exhibited superior performance. Therefore, these could be useful donor parents for promoting rapid seed germination when breeding rice for direct-sown culture. One hundred seed weight was negatively correlated with germination rate. Path analysis suggested that 100 seed weight acted through a high indirect effect of free amino acid content on germination rate. Oxygen uptake and dehydrogenase activity also contributed to germination rate variability. Cultivar differences were evident for germination rate following aging and under low temperature (20 and 15 degrees C) and moisture stress ( ... polyethylene glycol 8000). Hulls did not contribute to variability in germination rate.