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Rice Genomics and Genetics 2013, Vol.4, No.3, 9
-
13
http://rgg.sophiapublisher.com
9
Research Report
Open Access
Identification of Superior Segregants for Drought Tolerance and Productivity
Traits in Backcross Inbred Lines (BILs ) Derived from NERICA Introgression
under Rainfed Ecosystem
Sangodele Emmanuel A.
1
, Hanchinal R.R
1
, Hanamaratti N.G.
1
, Vinay Shenoy
2
, Nadaf H.L.
1
1. Department of Genetics and Plant Breeding, University of Agricultural Sciences, Dharwad, Karnataka State, India;
2. Barwale Foundation, Hyderabad, AP, India;
Corresponding author email:
deleadeemma@yahoo.com;
Authors
Rice Genomics and Genetics, 2013, Vol.4, No.3 doi: 10.5376/rgg.2013.04.0003
Received: 25 Jan., 2013
Accepted: 28 Mar., 2013
Published: 08 May, 2013
This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and
reproduction in any medium, provided the original work is properly cited.
Preferred citation for this article:
Sangodele et al., 2013, Traits in Backcross Inbred Lines (BILs ) Derived from NERICA Introgression under Rainfed Ecosystem, Rice Genomics and Genetics,
Vol.04, No.2 9-13 (doi: 10.5376/rgg.2013.04.0003)
Abstract
The aim of this study was to identify promising genotypes for upland rice ecosystem especially in drought prone areas.
Backcross inbred line (BC
1
F
6
) developed from inter varietal cross of Swarna × NERICA were evaluated under water stressed
environment for physiological and productivity related traits in the pot experiment. The result showed a clear expression of donor
(NERICA) genome on the background of the recurrent parent (Swarna) in the BILs evaluated. Performance of BILs is generally
lower under water stressed treatment when compared with non-stressed treatment for all the traits studied except leaf temperature
which was higher under water stressed condition. Except for traits like leaf area and plant height, percentage reduction in
performance of BILs for physiological and productivity component traits under water stress treatment are generally lower than the
recurrent parent Swarna indicating their superiority over recurrent parent for drought tolerance.
Keywords
Rice; Backcross inbred line; drought tolerance; Productivity; Rainfed ecosystem
1 Introduction
There is an extensive genetic variation for drought
tolerance in rice germplasm (Serraj et al., 2011) but
not much is achieved in breeding for drought
tolerance in rice because of complexity and nature
of drought. A good knowledge of complexity and
the nature of drought is necessary in breeding for
drought tolerance. Variability of drought within and
between seasons is location specific. Therefore
breeding for drought tolerance requires adequate
study of environmental factors which interact with
water deficit to create complexity called “drought”.
Several breeding programme aim at developing
high yielding drought tolerant cultivar has not been
able to overcome yield barrier. According to
Serraj et al., (2011) most of the varieties grown in
rainfed ecosystems were originally developed for
irrigated ecosystems; such varieties were basically
screened for yield without screening for drought
tolerance; such varieties often fail in the season
where there is severe drought. It is imperative to
develop high yielding drought tolerant rice varieties
for rainfed upland rice especially sub-Saharan
Africa where most rice areas are in upland
ecosystem.
Management practice such as delay transplanting
has been employed by farmers in respond to delay
rainfall and water stress; this however results in
yield loss (Verulkar et al., 2010). Serraj et al., (2011)
reported an experiments conducted at IRRI in 2005,
where rice seedlings transplanted at 65-day-old as
opposed to 22-day-old resulted in a yield reduction
of more than 50%, averaged across 125 cultivars
(Atlin et al., 2006). It is important to mention at this
point that risk of crop failure due to drought stress
can be reduced by selection for high yielding and
drought tolerant genotypes adapted to target drought
prone areas in any crop improvement programme.
Although there is a lot of variability in rice
germplasm for drought tolerance, variability to
delay transplanting has not been fully studied
transplanting (Verulkar et al., 2010).
Resource poor farmers in drought prone areas need