Field Technique and Traits to Assess Reproductive Stage Cold Tolerance in Sorghum (<i>Sorghum bicolor</i> (L.) Moench

Krishnamurthy, L.; Elango, Dinakaran; Kumar, A Ashok; Reddy, Belum V. S.

doi:10.1626/pps.17.218

Cited by 7 publications

(9 citation statements)

References 21 publications

(26 reference statements)

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“…Regarding screening methods, the PHI is the most suitable and reliable trait for the observation of reproductive cold tolerance in sorghum [14], providing the best approximation for spikelet fertility [36,37] by reducing the effect of different spikelet numbers. While spikelet fertility is the crucial trait when evaluating lines seeking for tolerance sources, for hybrid evaluation, the seed yield also obviously needs to be measured, since the PHI indicates pollen fertility, but not the yield potential which is also determined by spikelet number.…”

Section: Suitable Screeningmethods For Reproductive Cold Tolerancementioning

confidence: 99%

“…The peduncles of each panicle were cut just below the first branches before determining the panicle weight. Subsequently, the Panicle Harvest Index (PHI) was calculated according to Krishnamurthy et al [14]: PHI = grain dry weight (i.e., seed yield per panicle)/panicle dry weight (before threshing) (1)…”

Section: Field Trialsmentioning

confidence: 99%

“…In this context, Leon Velasco et al [12] described heterosis for the traits grain yield, seed weight and seed number in sorghum F 1 hybrids under cold stress. Krishnamurthy et al [14] evaluated the reproductive cold tolerance of sorghum under the Indian post-rainy season and suggested the trait Panicle Harvest Index (PHI), which represents the level of seed set per panicle, calculated as ratio between seed yield (after threshing) and whole panicle weight (before threshing) as an efficient score for spikelet fertility.…”

Section: Introductionmentioning

confidence: 99%

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Reproductive Cold Stress Tolerance in Sorghum F1 Hybrids is a Heterotic Trait

Schaffasz¹,

Windpassinger²,

Snowdon³

et al. 2019

Agronomy

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The sensitivity of sorghum to pre-flowering cold stress, resulting in reduced pollen viability and poor seed set, is a major constraint for expanding growing areas into higher altitudes and latitudes. Nevertheless, compared to juvenile cold tolerance, reproductive cold tolerance in sorghum has received much less attention so far, and very little is known about its inheritance in F1-hybrids. We have composed a representative factorial (n = 49 experimental F1-hybrids) for a comprehensive study on heterosis and combining ability for crucial tolerance traits as spikelet fertility (panicle harvest index), seed yield and pollen viability, using field trials in stress- and control environments in Germany and Mexico as well as climate chamber experiments. Our results indicate a heterotic and rather dominant inheritance of reproductive cold tolerance in sorghum, with strong effects of female general combining ability (GCA) on F1-hybrid performance in our material. These findings, together with the comparatively low contribution of specific combining ability (SCA) effects and high heritability estimates, suggest that robust and efficient enhancement of reproductive cold tolerance is feasible via hybrid breeding.

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Section: Suitable Screeningmethods For Reproductive Cold Tolerancementioning

confidence: 99%

Section: Field Trialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reproductive Cold Stress Tolerance in Sorghum F1 Hybrids is a Heterotic Trait

Schaffasz¹,

Windpassinger²,

Snowdon³

et al. 2019

Agronomy

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“…Sorghum is grown worldwide as a multipurpose crop [7]. It can tolerate adverse climatic conditions like drought [8] and temperature fluctuations [9,10] and can grow on marginal soils [11,12]. The crop is capable of overcoming adverse climatic conditions through flexible growth patterns and sustains grain and biomass production levels [13].…”

Section: Introductionmentioning

confidence: 99%

Growth, Yield and Nutritional Performance of Sweet Sorghum and Legumes in Sole and Intercropping Influenced by Type of Legume, Nitrogen Level and Air Quality

Arshad¹,

Nawaz²,

Ahmad³

et al. 2019

Pol. J. Environ. Stud.

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Sweet sorghum is a drought-tolerant cereal widely grown as pure stand in water-scarce areas. In the context of ongoing climate change, some agronomic adjustments are required for sustainable food production. Intercropping sweet sorghum with mungbean and soybean was assessed under three N levels (30, 60, 120 kg ha-1) and two types of air quality environments (charcoal filtered air and ambient air). Grain yield of sweet sorghum was significantly (P≤0.001) reduced in intercropping with mungbean (4.5 t ha-1), but remained on par (P>0.05) between sole cropping (5.1 t ha-1) and intercropping with soybean (5.1 t ha-1). Nitrogen application at 60 kg ha-1 optimized the grain yield, LER (1.8-1.9) and nutritional outputs of carbohydrate, protein, fat, and energy in intercropping (4.7 t, 1.0 t, 0.2 t, and 102.5 MJ ha-1 , respectively) compared to that in sole cropping of sweet sorghum (3.6 t, 0.5 t, 0.1 t, and 74.6 MJ ha-1 , respectively). Charcoal-filtered air with reduced air pollutants of O 3 , NO 2 and SO 2 significantly (P≤0.05) improved the growth and seed yield of intercropped mungbean (2.1 tha-1) and soybean (1.8 tha-1), and overall land productivity compared to ambient air (1.7 and 1.2 t ha-1 , respectively).

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“…Over time a steady development of sorghum lines and hybrids with enhanced reproductive cold tolerance has taken place in Mexico ( Osuna-Ortega et al, 2000 , 2001 , 2003 ; Cisneros-López et al, 2009 , 2010 ; León-Velasco et al, 2009 ). Furthermore, evaluation of reproductive cold tolerance in the Indian post-rainy season by Krishnamurthy et al (2014) suggested that Panicle Harvest Index (PHI) can be efficiently scored as a proxy for spikelet fertility. In a recent study, Schaffasz et al (2019) analyzed several traits related to reproductive cold tolerance in a line × tester design, showing a dominant inheritance and heterotic effect in F 1 hybrids.…”

Section: Introductionmentioning

confidence: 99%

Genetic Architecture of Novel Sources for Reproductive Cold Tolerance in Sorghum

et al. 2021

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Enhancements in reproductive cold tolerance of sorghum are essential to expand growing areas into both high-latitude temperate areas and tropical high-altitude environments. Here we present first insights into the genetic architecture of this trait via genome-wide association studies in a broad genetic diversity set (n = 330) phenotyped in multi-location field trials including high-altitude tropical (Mexico) and high-latitude temperate (Germany) environments. We observed a high degree of phenotypic variation and identified several novel, temperate-adapted accessions with superior and environmentally stable cold tolerance. Good heritability indicates strong potential for implementation of reproductive cold tolerance in breeding. Although the trait was found to be strongly quantitative, promising genomic regions with multiple-trait associations were found, including hotspots on chromosomes 3 and 10 which contain candidate genes implicated in different developmental and survival processes under abiotic stress conditions.

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Field Technique and Traits to Assess Reproductive Stage Cold Tolerance in Sorghum (Sorghum bicolor (L.) Moench

Cited by 7 publications

References 21 publications

Reproductive Cold Stress Tolerance in Sorghum F1 Hybrids is a Heterotic Trait

Reproductive Cold Stress Tolerance in Sorghum F1 Hybrids is a Heterotic Trait

Growth, Yield and Nutritional Performance of Sweet Sorghum and Legumes in Sole and Intercropping Influenced by Type of Legume, Nitrogen Level and Air Quality

Genetic Architecture of Novel Sources for Reproductive Cold Tolerance in Sorghum

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