Responses of earliness and lateness genes for heading to different photoperiods, and specific response of a gene or a pair of genes to short day length in rice.
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Key Findings
Abstract
BACKGROUND: Heading time is an important trait for regional and seasonal adaptabilities in rice, and is controlled by genetic factors in relation with environmental factors, mainly day length and temperature. The following genes controlling heading were examined for their responses to six different environmental conditions involving different day lengths using five early near-isogenic lines (NILs) of T65-R and three late NILs of T65wx: two earliness genes, and controlling basic vegetative phase (BVG), and , the enhancer to the former gene; and two lateness genes, (t) and controlling photo-sensitivity and BVG, respectively. T65-R and T65-T were different accessions of Taichung 65. T65wx is a NIL of T65-T carrying . RESULTS: The five early NILs of T65-R were in the order of ER50 (, , ) < ER40 (, ) ≤ ER20 (, ) < ER1 () ≤ ER21 () < T65-R regarding days to heading (DTH) under two spring-sowing and one summer-sowing paddy field (PF) conditions. The three late NILs of T65wx were in the order of LF3 ((t)) ≤ LF2 ((t), ) ≤ T65wx < LF1 () under two short-day conditions (10-h photoperiod condition with artificial-light and natural short-day condition from autumn to winter). The NILs and T65wx were in the order of T65wx < LF3 < LF1 < LF2 under the two spring-sowing PF (long day) conditions. T65-R () was 2.8 or 5.1 days earlier in DTH than T65-T () under the two spring-sowing PF conditions. However, T65-R was 19 and 10 days earlier than T65-T under the two short-day conditions. CONCLUSIONS: Earliness gene(s) and their combinations reduced DTH regardless of photoperiod lengths. (t) increased DTH under long-day conditions but decreased it under short-day conditions, while elongated DTH under both short-day and long-day conditions indicating that is responsible for BVG. The increased DTH by adding its effect over that of (t) under long-day conditions. However, this increasing effect of DTH by was almost completely masked when it coexisted with (t) under the short-day conditions. Notably, the response of to day length was found to delay heading under the short-day conditions.
Affiliation
1The United Graduate School of Agricultural Sciences, Ehime University, Matsuyama, Ehime Japan.
External References
- PubMed ID:
- 31889942
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