Physiological studies of the performance of sorghum genotypes under moisture limiting conditions

Tangpremsri, Thongchai

doi:10.14264/uql.2017.652

Cited by 4 publications

(3 citation statements)

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“…Under TD, the relative rate of leaf senescence was correlated with AGDM

\begin{matrix} true(r = {- 0.77}^{*} * * true) \end{matrix}

, but not with harvest index (Table 1), suggesting the association between high grain sink/source ratio and senescence under water‐limited conditions reported by Henzell and Gillieron (1973), Duncan et al (1981), Rosenow et al (1983), and Tangpremsri (1989) can be broken. Indeed, AQL41/RQL12 attained a high grain yield under terminal deficit by combining a low rate of leaf senescence with a high harvest index.…”

Section: Resultsmentioning

confidence: 82%

Does Maintaining Green Leaf Area in Sorghum Improve Yield under Drought? II. Dry Matter Production and Yield

2000

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Retention of green leaf area at maturity (GLAM), known as stay‐green, is used as an indicator of postanthesis drought resistance in sorghum [Sorghum bicolor (L.) Moench] breeding programs in the USA and Australia. The critical issue is whether maintaining green leaves under postanthesis drought increases grain yield in stay‐green compared with senescent hybrids. Field studies were undertaken in northeastern Australia on a cracking and self‐mulching gray clay. Nine closely related hybrids varying in rate of leaf senescence were grown under two water‐limiting regimes, post‐flowering water deficit and terminal (pre‐ and postflowering) water deficit, and a fully irrigated control. Under terminal water deficit, grain yield was correlated positively with GLAMtrue(r=0.75**true) and negatively with rate of leaf senescence true(r=−0.74**true) Grain yield also increased by ≈0.35 Mg ha−1 for every day that onset of leaf senescence was delayed beyond 76 DAE in the water‐limited treatments. Stay‐green hybrids produced 47% more postanthesis biomass than their senescent counterparts (920 vs. 624 g m−2) under the terminal water deficit regime. No differences in grain yield were found among eight of the nine hybrids under fully irrigated conditions, suggesting that the stay‐green trait did not constrain yield in the well‐watered control. The results indicate that sorghum hybrids possessing the stay‐green trait have a significant yield advantage under postanthesis drought compared with hybrids not possessing this trait.

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“…Under TD, the relative rate of leaf senescence was correlated with AGDM

\begin{matrix} true(r = {- 0.77}^{*} * * true) \end{matrix}

Section: Resultsmentioning

confidence: 82%

Does Maintaining Green Leaf Area in Sorghum Improve Yield under Drought? II. Dry Matter Production and Yield

2000

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“…The stay-green trait is positively correlated with sorghum grain yield in field conditions under terminal drought ( Borrell et al ., 1999 , 2000b ; Jordan et al ., 2003 , 2012 ). Establishing this correlation is important because sorghum breeders were initially concerned that leaves may remain green simply because of a small sink demand, indicating that stay-green may be correlated with low grain yield ( Henzell and Gillieron, 1973 ; Duncan et al , 1981 ; Rosenow et al , 1983 ; Tangpremsri, 1989 ). One of the most convincing earlier pieces of evidence came from a trial at ICRISAT, India, where a strong positive relationship between green leaf dry mass at 25 days after anthesis and grain yield in a set of 160 RILs (BQL39 (senescent) × BQL41 (stay-green)) was demonstrated for field-grown sorghum in the post-rainy season ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Drought adaptation of stay-green sorghum is associated with canopy development, leaf anatomy, root growth, and water uptake

Borrell

Mullet

George‐Jaeggli³

et al. 2014

Journal of Experimental Botany

315

279

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“…From the above lines, only JB30 was ranked in the top 75% quartile for panicle harvest index, suggesting that the staygreen trait may not always be an important contributor to yield under well-watered environments. Numerous researches (Henzell and Gillieron, 1973;Duncan et al, 1981;Rosenow et al, 1983;Tangpremsri, 1989) suggested that staygreen might be correlated with low grain yield. However, Borrell et al (2014) did not find any consistent yield cost associated with the staygreen quantitative trait loci (QTLs) under irrigated conditions.…”

Section: Discussionmentioning

confidence: 99%

Agro-morphological characterization of diverse sorghum lines for pre-and post-flowering drought tolerance

Emendack¹,

Burke²,

Sanchez³

et al. 2018

Aust J Crop Sci

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The impact of drought stress on sorghum yield does not only depend on the intensity and timing of drought, but as well on the developmental stage of the crop. One of the limitations in breeding for pre-and/or postflowering drought stress resistance in sorghum is the less availability of diverse genetic sources possessing drought tolerant agro-morphological or physiological traits that could be introgressed into elite sorghum lines. This research evaluate a diverse group of 54 introgressed, converted, and commonly used sorghum breeding lines for their tolerance to field drought stress imposed at the pre-flowering and post-anthesis developmental stages in 2015 and 2016 growing seasons. Agro-morphological characteristics such as panicle area, panicle width, and percent green leaf and yield-related characteristics such as total above ground dry biomass and dry panicle weight were identified as significant predictors of grain yield under water stress. The current research identifies other sources that could be use by breeding programs as donor lines for traits related to pre-and postflowering drought tolerance in sorghum. Following statistical distribution and Tukey-Krammer HSD connecting letter tests, lines JB39, SC191, and SC270 and RIL R.11269 were identified as plausible sources for pre-flowering drought tolerance, and JB14, JB15, JB19, JB22, JB24, JB25, JB26, and JB33 as sources for the staygreen trait. While the staygreen is a good selection tool for postflowering drought tolerance, identifying staygreen lines with minimal reductions in grain yield and with earlier flowering dates (JB14, JB22, JB24 and JB25 in this study) than most commonly used staygreen donor lines, will ensure that grain yield is not over sacrificed by the ability of the crop to staygreen under terminal drought conditions.

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Physiological studies of the performance of sorghum genotypes under moisture limiting conditions

Cited by 4 publications

References 0 publications

Does Maintaining Green Leaf Area in Sorghum Improve Yield under Drought? II. Dry Matter Production and Yield

Does Maintaining Green Leaf Area in Sorghum Improve Yield under Drought? II. Dry Matter Production and Yield

Drought adaptation of stay-green sorghum is associated with canopy development, leaf anatomy, root growth, and water uptake

Agro-morphological characterization of diverse sorghum lines for pre-and post-flowering drought tolerance

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