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《Journal of Zhejiang University(Agriculture and Life Sciences)》 2015-06
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Tillering and earing characteristics of middle-season indica hybrid rice under long-age seedlings

LüTengfei;Zhou Wei;Li Yinghong;Zhang Shaowen;Li Yue;Sun Yongjian;Ma Jun;Key Laboratory of Crop Physiology,Ecology,and Cultivation in Southwest,Ministry of Agriculture/Rice Research Institute,Sichuan Agricultural University;College of Agronomy,Sichuan Agricultural University;  
Tillering and earing is a key factor for yield formation in rice and one of remarkable features of highyield colony,characterized by effective panicles per unit area.Transplanting seedling age is an important factor that may greatly affect tillering and panicle formation.Related researches have showed that by extending the transplanting seedling ages,the seedling quality would become worse;the tillering growth rate would slow down;the percentage of effective panicles would reduce;the numbers of effective panicle per plant and grains per paniclewould decrease,resulting in obvious reduction of grain yield.Due to the special landscape of the hilly areas in China,the long transplanting seedling age still existed in those areas.To investigate the effect of different seedlings per hole and water-nitrogen managements on tillering and panicle formation pattern under long seedling age,F you 498 was used as test material in this experiment.A threefactor split plot was conducted with transplanting seedling ages as the main plot;the water-nitrogen management patterns as the secondary plot and seedlings per hole as the third plot.The aim was to provide the theoretical and practical data for improving the grain yield of long transplanting seedling age in hilly areas.The results showed that the tillering capacity of the older-age seedlings was stronger,and the number of leaf positions of tillers and panicles were increased.And the tillering ability of different water-nitrogen management patterns was controlled alternate irrigation pattern dry cultivation patternsubmerged irrigation pattern under65 dseedling age.Meanwhile,single seedling in a hole had higher percentage of emerging and earbearing tiller than double seedlings in a hole at older seedling age.At 65 dseedling age,the contribution for yield was the primary tiller secondary tiller main stem third tiller;and the grain number per panicle and thousand-grain mass were primary tiller secondary tiller main stem,while the seed setting rate was primary tillermain stem secondary tiller.The superior leaf positions of emerging tiller of older seedling age were the first to ninth leaf for primary tiller,the first to second and seventh to eighth leaf for secondary tiller;the superior leaf positions of earbearing were the second,seventh to ninth leaf for primary tiller,and the first to third and seventh to eighth leaf for secondary tiller;the superior leaf positions of yield contribution were the sixth to ninth leaf for primary tiller,the first,second and seventh leaf for secondary tiller.It is concluded that the superior leaf positions of older seedling age rice are the first to second and seventh to ninth leaf,of which the total contribution to the yield reaches 68.95%.With the extension of seedling age,the yield obviously decreased;however,applying to single seedling per hole in combination with controlled alternate irrigation pattern can improve the yield of long-age seedlings effectively.
【Fund】: 国家“十二五”科技支撑计划(2011BAD16B05 2012BAD04B13 2013BAD07B13);; 四川省科技支撑计划(2014NZ0040 2014NZ0041 2014NZ0047);; 四川省育种攻关专项(2011NZ0098-15)
【CateGory Index】: S511.21
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