Heterosis Expression of Hybrid Rice in Natural- and Short-Day Length Conditions

doi:10.1016/S1672-6308(14)60286-9

Abstract

Abstract:

Development of hybrid rice is an important strategy to increase yields of irrigated rice in China. Day length is a highly important environmental factor for hybrid rice adaptability, productivity and quality. Heterosis of hybrid rice has been utilized under natural- (long) day length conditions in the middle and lower reaches plain of Yangtze River Valley in China for a long time. However, whether the hybrid rice can show heterosis under short-day length conditions is unknown. In this study, we analyzed plant height, grain number per panicle, and other yield related traits of hybrid rice Liangyoupeijiu (LYP9) and its parents (Pei’ai 64S and 93-11) under natural- and short-day length conditions and compared the respective heterosis. Results showed that earlier heading, reduced plant height, and reduced grain number per panicle were found in these three varieties under short-day length conditions relative to those under natural-day length conditions. In either natural- or short-day length conditions, heterosis of LYP9 was mainly displayed in grain number per panicle and plant height. This study may help in breeding and selecting suitable hybrid rice for different regions with natural- or short-day length.

Key words: hybrid rice, heterosis, photoperiod, short-day length

Zhi-yuan Huang, Bing-ran Zhao, Qi-ming Lv, Xi-qin Fu, Ye-yun Xin, Long-ping Yuan. Heterosis Expression of Hybrid Rice in Natural- and Short-Day Length Conditions[J]. Rice Science, 2015, 22(2): 81-88.

Figures/Tables 7

References 30

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Variety	Treatment	Days from Sowing to heading (d)	Days from sowing to harvest (d)	Treatment time (Month-Day)	Short-day treatment (d)
PA64S	Natural-day	77	NA ^a
	Short-day	70	NA	07-21 to 08-24	34
LYP9	Natural-day	94	133
	Short-day	85	116	07-26 to 08-27	32
Nov-93	Natural-day	94	133
	Short-day	87	116	07-22 to 08-28	37

Variety	Treatment	Days from Sowing to heading (d)	Days from sowing to harvest (d)	Treatment time (Month-Day)	Short-day treatment (d)
PA64S	Natural-day	77	NA ^a
	Short-day	70	NA	07-21 to 08-24	34
LYP9	Natural-day	94	133
	Short-day	85	116	07-26 to 08-27	32
Nov-93	Natural-day	94	133
	Short-day	87	116	07-22 to 08-28	37

Variety	Sowing date (Year-Month-Day)	Initial heading date	Full heading date	Days from sowing to full heading	Days from sowing to harvest
Variety	Sowing date (Year-Month-Day)	(Year-Month-Day)	(Year-Month-Day)	(d)	(d)
PA64S	2012/12/20	2013-03-25		87
LYP9	2012/12/10	2013/3/15	2013/4/13	89	124
Nov-93	2012/12/10	2013-03-25	2013/4/25	102	136

Variety	Sowing date (Year-Month-Day)	Initial heading date	Full heading date	Days from sowing to full heading	Days from sowing to harvest
Variety	Sowing date (Year-Month-Day)	(Year-Month-Day)	(Year-Month-Day)	(d)	(d)
PA64S	2012/12/20	2013-03-25		87
LYP9	2012/12/10	2013/3/15	2013/4/13	89	124
Nov-93	2012/12/10	2013-03-25	2013/4/25	102	136

Variety and heterosis	Treatment	Plant height	Effective panicle number per plant	Grain number per panicle	Seed-setting rate	1000-grain weight
Variety and heterosis	Treatment	(cm)	Effective panicle number per plant	Grain number per panicle	(%)	(g)
PA64S	Natural-day	83.8 ± 3.3 Bb	10.6 ± 2.0 Bb	177.1 ± 18.1 Aa
PA64S	Short-day	80.2 ± 3.5 Aa	10.6 ± 3.9 Bb	159.4 ± 24.9 ABab
LYP9	Natural-day	124.7 ± 4.7 Fe	8.2 ± 1.7 Aa	190.3 ± 23.2 ABb	65.0 Aa	26.42 ± 0.72 Aa
LYP9	Short-day	118.3 ± 3.8 CDc	7.3 ± 1.6 Aa	179.0 ± 21.5 Bb	84.0 Bb	27.25 ± 0.75 Ab
Nov-93	Natural-day	120.7 ± 4.5 Dd	7.3 ± 1.5 Aa	178.2 ± 41.1 Bb	80.0 BCc	31.33 ± 1.32 Bc
Nov-93	Short-day	116.6 ± 4.9 Cc	7.3 ± 1.6 Aa	143.4 ± 41.0 Bb	88.0 Cc	31.44 ± 0.72 Bc
MPH (%)	Natural-day	22		7.1
HPH (%)	Natural-day	3.3		6.8
MPH (%)	Short-day	20.3		18.2
HPH (%)	Short-day	1.5		12.3