PJB-2023-493
SEASONAL VARIATION OF FLOWERING TIME OF SRI LANKAN TRADITIONAL RICE
W.H.D.U.PUSHPAKUMARI
Abstract
Sri Lankan traditional rice (Oryza sativa indica) exhibits a wide natural variation in days to flowering under tropical condition in Sri Lanka. Growing season is a critical factor for traditional rice cultivation. Determination of response to the natural growing season which is variable in a short range of photoperiod must be important to identify promising accessions for specific planting dates of two seasons. This experiment was conducted to determine the effect of planting date on selected agronomic characters of days to flowering (DF), plant height at flowering (PH) and number of spikelets per first panicle (SPP) of selected 10 traditional rice accessions (4132 and 5530 of Masuran, 4387 and 4237 of Ma wee, 4290 of Kurumawee, 4145 and 4772 of Mudukirial, 4731 of Hondarawala, 6412 of Herath and 2170 of Kuruluthuda) based on their variation in DF in previous experiments. Accessions were planted at one month intervals for a period of 12 months from November 2018 to October 2019. DF, PH and SPP varied among accessions during the 12 planting dates. Three patterns of DF variation could be observed among accessions and DF values increased during the months of Yala season. Significant differences were observed due to the interaction effect of accession and planting date on DF, PH and SPP (P ≤ 0.05). The regression analysis revealed that the relationship between DF and SPP was quadratic for accessions 4132, 5530, 4387, 4290, 4145, and 4772, while accession 4237 and improved variety Bg 300 indicated a significant positive linear correlation. Our results would provide insights on manipulating DF in rice for short aged varieties to adapt to future adverse changes in climate without compensating the yield.
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