Growth and Yield of Near-Isogenic Wheat Lines Carrying Different Vernalization Response Genes

Distribution of photoperiod-insensitive alleles Ppd-B1a and Ppd-D1a and their effect on heading time in Japanese wheat cultivars

“…These results suggest that grain yield of early-heading cultivars carrying the two photoperiod-insensitive genes Ppd-B1a/Ppd-D1a will be lower, especially in warm-winter seasons. However, Fujita et al (1995) and Seki et al (2007) reported that the yearly fluctuation of heading time is smaller in the winter-type NILs of ‘Abukumawase’ carrying Ppd-B1a/Ppd-D1a . The fluctuation of heading time due to early sowing is also estimated to be smaller in winter type wheat ( Fujita et al .…”

Growth and Yield Properties of Near-Isogenic Wheat Lines Carrying Different Photoperiodic Response Genes

“…These lines were developed by backcrossing five times with Vrn-A1 type NIL of Abukumawase, "Ab (VrnA1)" after Seki et al (2007), since "Ab (VrnA1)" was highly spring type with no requirement of vernalization and thus the effect of vernalization requirement could be neglected. "Ab (VrnA1)" carryed photoperiodic-insensitive alleles Ppd-B1a and Ppd-D1a, and Haruhikari was used as a donor of photoperiod-sensitive alleles Ppd-B1b and Ppd-D1b.…”

Tillering Responses to High Red/ Far-Red Ratio of Four Japanese Wheat Cultivars

“…In general, early wheat cultivars in southwestern Japan are insensitive to photoperiod, therefore the development will be earlier in a warm-winter year than in a usual year, resulting in a frequent occurrence of frost damage due to early jointing (Taya, 1993;Fujita, 1997;Seki et al, 2007). Iwainodaichi was developed by genetic improvement of the vernalization requirement for early maturing to avoid tiller frost through the stability of jointing (Fujita, 1997).…”

“…Furthermore, the yield of early wheat cultivars (cultivar with low vernalization requirement) in southwestern regions of Japan are prone to decrease and unstable in warm-winter year due to the reduction of spike number caused by the shortening of tillering period (Taya, 1993;Fujita, 1997;Seki et al, 2007). Therefore, the influence of the vernalization requirement of cultivars on tillering responses by light environment should be explored.…”