Premium
Effects of day‐length and night temperature on the flowering of sorghum varieties with a dominant thermosensitivity gene
Author(s) -
Yanase Masanori,
Tarumoto Isao,
Kasuga Shigemitsu
Publication year - 2008
Publication title -
grassland science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.388
H-Index - 19
eISSN - 1744-697X
pISSN - 1744-6961
DOI - 10.1111/j.1744-697x.2008.00106.x
Subject(s) - sorghum , day length , biology , long day , habit , photoperiodism , horticulture , sowing , sorghum bicolor , botany , cultivar , zoology , agronomy , psychology , psychotherapist
This study aimed to clarify the flowering habit in sorghum varieties with a dominant thermosensitivity gene. The number of days from sowing to floral initiation in four varieties with a dominant thermosensitivity gene ( TT and Tt ) and two varieties of which flower initiation does not depend strongly on day‐length and night temperatures were evaluated under different day‐length and temperature conditions. The day‐length treatment at 25°C indicated that anything over a 12.5‐h day‐length has a long day effect on the flowering of the sorghum varieties examined. Under a long day condition of a 12.5‐h day‐length, floral initiation was accelerated under 30°C/20°C (day/night) conditions, compared to 25°C (constant) conditions in the varieties with a dominant thermosensitivity gene. Under a 15‐h day‐length, floral initiation was accelerated at night temperatures of 20°C and 15°C instead of at the constant 25°C. These results suggest that floral initiation was accelerated by a night temperature of lower than 20°C, even under long day‐length conditions in sorghum varieties with a dominant thermosensitivity gene.