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Stay-green QTL Stg3B is the key QTL associated with improved grain and stover yield under post-rainy sorghum growing conditions

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Relation http://oar.icrisat.org/10245/
 
Title Stay-green QTL Stg3B is the key QTL associated with improved grain and stover yield under
post-rainy sorghum growing conditions
 
Creator Talwar, H S
Deshpande, S P
Madhusudhana, R
Kumar, Shiwesh
Vadez, V
Tonapi, V A
 
Subject Sorghum
 
Description Stay-green is the best characterized trait contributing to the
adaptation of sorghum to postflowering drought conditions.
Using B35 as stay-green donor, QTL introgression lines (ILs)
were generated in two genetic backgrounds (S35 and R16).
These lines along with local checks, recurrent parent and staygreen
donor were evaluated in two years during the post-rainy
season under both well-watered (WW) and water-stressed
(WS) conditions at four locations. Stay-green ILs had improvement
in green leaf area retention at maturity (GLAM) in both
genetic backgrounds under both WW and WS, and more so
under WS condition. R16 was more responsive to the QTL introgression
than S35 in terms of GLAM, suggesting that effect
of individual stay-green QTL introgression interacted with genetic
backgrounds. Stg3B was the key stay-green QTL in enhancing
the GLAM, particularly under WS conditions. Under
WS conditions, the introgressions with Stg3B improved grain
yield (GY) and total dry matter (TDM) by 16% and 9%, respectively
over recurrent parent. No improvement in GY and TDM
was recorded in ILs compared to recurrent parent under WW
conditions in S35 background, while 8% increase in both GY
and TDM was recorded under WS conditions with Stg3B introgressions
in S35 background. The recipient genetic background
and soil moisture conditions during postflowering growth stages
played an important role in the expression of stay-green
QTLs. Our results, also clearly established the superiority of
Stg3B in enhancing the GY and TDM accumulation over other
individual QTLs or in combination under both the genetic backgrounds,
particularly under WS conditions.
 
Date 2017-02
 
Type Conference or Workshop Item
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/10245/1/Abstract_Book_46.pdf
Talwar, H S and Deshpande, S P and Madhusudhana, R and Kumar, Shiwesh and Vadez, V and Tonapi, V A (2017) Stay-green QTL Stg3B is the key QTL associated with improved grain and stover yield under post-rainy sorghum growing conditions. In: InterDrought-V, February 21-25, 2017, Hyderabad, India.