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《(牠丁文)acta Agriculturae Nucleatae Sinica》 2003-01
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STUDY ON SEED SET AND HETEROSES OF DISTANT CROSS OF UPLAND RICE( Oryza sativa) ×LONG-AWN-BARNYARD-GRASS( Echinochloa caudata)

LI Hui\|min\+1\ ZHAO Feng\|wu\+1\ LI Ai\|guo\+1\ BAI Li\|rong\+1\ ZHANG Jian\+1 ZHAO Ming\+2\ WANG Zhi\|min\+2\ ZHAO Xiu\|qin\+2 (1.Dry Land Farming Institute,HAAFS,Hengshui Hebei prov\ 053000; 2.Chinese Agricultural University,Beijing\ 100094)  
years successive observation on progenies of a distant cross of upland rice Han 65( Oryza sativa) ×Long\|awn\|barnyard\|grass( Echinochloa caudata), a summer dominant native grass showed that.(1)F\-0 generation was highly infertile,seed set was only 1\^21‰,which coincided with seed abortion under multiple repeating pollination on about 800 florets.(2)F\-1 generation performed very good heteroses and good fertility,the seed set was 92\^26% and yield advantage was 80\^39% over its female.(3)Wild segregating were happened on agronomic characters but none for fertility in F\-2 one.There was no sterile plant observed in the total of 405 plants.(4)“Yuan F\-2\|1”,a excellent variant plant selected from F\-2′s,whose yield advantage was 55\^64% over its female.Characteristics of heads/plant,plant height,first branches of main stem,florets/main stem,seeds/main stem as well as seed set/main stem were recorded from 160 plants of F\-3 derived from “Yuan F\-2\|1”.Heterosis of them was 1\^02%,15\^18%,47\^26%,33\^84%,24\^62% and 2\^27%,respectively.Differences were significant comparing with its maternal by means of variance analysis.(5)Photosynthetic rate of F\-5 was 29\^72% higher than that of parent,Han 65.
【Fund】: 河北省自然科学基金 (30 2 4 5 2 )资助项目
【CateGory Index】: S511.6
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