TITLE:
Quantifying Effects of Photoperiod, Temperature and Humidity on Flowering Initiation in Basmati Rice Lines
AUTHORS:
Tahir Latif, Zulqarnain Haider, Muhammad Ramzan, Muhammad Akhter, Sadia Gull, Abid Mahmood, Awais Riaz, Rana Ahsen Raza Khan
KEYWORDS:
Basmati Rice, Flowering, Photoperiod, Temperature, Humidity
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.10 No.6,
June
11,
2019
ABSTRACT:
The results suggested that
all the pure Basmati lines or genotypes initiate flowering within a specific
range of day length duration and temperature. Delaying the transplanting date
did not significantly affect the flowering time of studied Basmati lines.
Maximum threshold of daily minimum temperature (MT) was 24°C during both the
years. Likewise, maximum threshold of daily day-length (DL) durations was 12
hours and 18 minutes during both the study years. Results showed that the
flowering was maximum when the MT and DL values were optimum as depicted by
peak of the trend lines, where maximum lines flowered. Maximum flowering
initiations took place when DL was about 11 hours and 15 minutes indicating
Basmati as short day plant which flowers maximum when day lengths are shorter
and dark or night duration is longer. During 2013, 1st date trial showed strong
relationship between flowering initiation with dates of flowering during the
flowering period as depicted by higher regression (R2 = 0.837) values.
In 2nd date trial during the same year, the value is lower (R2 =
0.513) depicting less relationship of flowering initiation with the dates of
flowering. The same trend was observed in 2014 trial. In 1st date trial, strong
relationship between flowering initiation with dates of flowering during the
flowering period as depicted by higher regression (R2 = 0.864)
values, was observed. In 2nd date trial during the same year, the value is
lower (R2 = 0.1789) depicting very poor relationship of flowering
initiation with the dates of flowering, and the same trend (R2 =
0.0544) in 3rd date of trial.