MIME-Version: 1.0 Content-Location: file:///C:/EA4356B8/Abstract48.htm Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="us-ascii" Correlation and path coefficient studies among grain yield and root characteristics under aerobic condition in rice (Oryza sativa L

Correlation and path coefficie= nt studies among  grain yield and root characteristics under aerobic condition = in rice (Oryza sativa L.)<= /p>

 

 

K.B.Kemparaju,  M.P.Rajanna,  M.R.Gururaja<= /span> Rao and M.S.Sheshshayee

AICRP(Rice), Zonal Agricultural Research Station (UAS), V.C.Farm,  Mandya, Karnataka

 

 

Forty eight diverse rice genotypes were grown under aerobic condition at Zonal Agricultural Research Station, V.C.Farm, Mandya and studied the relationship among 12 yield and yield component characters viz., days to 50% flowering, plant height, leaves per hill, productive tillers per hil= l, panicle length, spikelet fertility, grains per panicle, test weight, grain yield per hill, harvest index, carbon isotope discrimination (∆ 13 C) and leaf area duration (LAD). Simi= lar studies were also made on four different root traits viz. root lengt= h, root volume, root dry weight and oxygen isotope enrichment (d18O) of 20 high yielding genotypes selected from among the 48 genotyp= es. Further, the contribution of each character towards grain yield was also studied through path coefficient analyses. =

 

Correlation studies revealed that days taken to 50 per cent flowering had highly significant positive influence on grain yield both at genotypic and phenoty= pic levels. Further, grains per panicle, panicle length, leaves per hill  and= LAD exhibited positive and significant influence on grain yield at genotypic le= vel while, harvest index showed positive significant influence on grain yield at phenotypic level only.

 

The direct and indirect effects of component traits on grain yield has revealed= by the path coefficient analysis, harvest index had maximum positive direct ef= fect on grain yield at phenotypic level while, days to 50% flowering had maximum positive direct effect on grain yield both at phenotypic and genotypic leve= ls. Panicle length and plant height also showed maximum positive direct effect = on grain yield.  Productive tille= rs and LAD had moderate levels of direct influence on grain yield. On the contrary grains per panicle, spikelet fertility, test we= ight, leaves per hill and harvest index at genotypic level; panicle length, test weight, leaves per hill and ∆13C at phenotypic level registered negative influence on grain yield.

 

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