PJB-2017-171
PHOTOPERIOD DRIVEN DAYS TO FLOWERING VARIATION AFFECT VEGETATIVE GROWTH AND YIELD IN SRI LANKAN TRADITIONAL RICE (ORYZA SATIVA L) MA WEE
W.H.D.U. Pushpakumari, Gamini Senanayake and Sudarshanee Geekiyanage
Abstract
Variation in days to flowering (DF) is evident in Sri Lankan traditional rice (SLTR) with short aged and long aged varieties while short day sensitive extremes do not flower during non inductive season. Ma wee varieties of SLTR are known for photoperiod sensitivity while being candidates for adaptability to adverse environments. Effect of two photoperiod regimes during Maha growing season {late Maha (LM) of more long days in 2013/2014 and early Maha (EM) of more short days in 2014/2015} on vegetative growth parameters, DF and yield components were determined in 43 Ma wee accessions (close to the number of total collection at gene bank) under Sri Lankan field condition. Only 9 accessions flowered out of 43 accessions during experimental period of ten months in LM. DF was variable within season among above accessions as 71 ± 5.3 to 164 ± 2.1 in LM and 51 ± 0.4 to 166 ± 6 in EM. Except for accession 3598 DF of above accessions were lower in EM in contrast to that in LM. Plant height (PH), DF and grains per panicle (GPP) were significantly affected by season, accession and interaction of accession and season. Total tiller number (TTN) was mainly affected by accession and interaction of accession and season. Yield components of total panicle weight (TPW), grains per panicle (GPP) and first panicle weight (FPW) were increased by increasing DF in EM as TPW= 117.5 +3.465 DF -0.01398 DF2, GPP = 78.36 + 1.478 DF, and FPW = 1.364 +0.03031DF while, hundred grain weight (HGW) was decreased as HGW = 3.724 - 0.01160 DF. Our results on relationships between DF and yield and, DF and vegetative growth in Ma wee at 2 photoperiodic seasons as the first report for Ma wee according to the best of our knowledge would be useful in manipulating DF for better yields in breeding programmes.
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