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Guenni, Orlando; Marín, Douglas; Baruch, Zdravko

doi:10.1023/a:1019956719475

Cited by 94 publications

(32 citation statements)

References 27 publications

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“…3; Table 1). The increase in root biomass contrasts with findings for other plants (Fernandez and Reynolds 2000; Guenni et al 2002; Blum 2005; Bahrani et al 2010; Haffani et al 2014) and other studies on H. contortus (Williams and Black 1994), where root dry weight decreased under drought treatment. Van Den Berg and Zeng (2006) reported that H. contortus in South Africa involves a dramatic increase in root length under slight drought stress, it is an adaptive response to reach deeper water in the soil.…”

Section: Discussioncontrasting

confidence: 93%

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Morphological and physiological responses of Heteropogon contortus to drought stress in a dry-hot valley

Wang

Yan

et al. 2016

Bot Stud

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Background Heteropogon contortus is a valuable pasture species that is widely used for vegetation restoration in dry-hot valleys of China. However, to date, its morphological and physiological responses to drought, and the underlying mechanisms are not well understood. This study was aimed to investigate the morphological and physiological changes of H. contortus under drought stress during the dry-hot season. Heteropogon contortus was planted in pots and subjected to four levels of soil water treatments: above 85 % (control), 70–75 % (light stress), 55–60 % (moderate stress) or 35–40 % (severe stress) of field capacity.ResultsWithin the total stress period (0–29 days), H. contortus grew rapidly in the light stress, whereas severe stress had a negative impact on growth. Aboveground biomass decreased together with increasing drought stress, whereas root biomass increased. Consequently, the root/shoot ratio of the severe stress treatment increased by 80 % compared to that of the control treatment. The ratio of bound water/free water (BW/FW) was the most sensitive parameter to drought and showed a value under severe stress that was 152.83 % more than that in the control treatment. Although leaf water potential (LWP) and leaf relative water content (RWC) decreased with progressive water stress, H. contortus managed to maintain a relatively high RWC (nearly 70 %) in the severe stress condition. We also detected a significant reduction (below 0.6) in the ratio of variable fluorescence/maximum fluorescence (Fv/Fm) in the severe stress treatment.ConclusionsOur results show that H. contortus adapts to drought mainly by avoidance mechanisms, and its morphological and physiological characteristics are inhibited under severe stress, but can recover at a certain time after re-watering. These findings might help limited water resources to be fully used for vegetation management in the studied region.

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Section: Discussioncontrasting

confidence: 93%

“…However, Bahrani et al (2010) showed that no forage grasses possessed a significantly different R/S ratio than the control. Furthermore, Guenni et al (2002) found that drought treatment decreased the R/S ratio. Therefore, the pattern of biomass allocation might differ between tropical grass species.…”

Section: Introductionmentioning

confidence: 98%

Morphological and physiological responses of Heteropogon contortus to drought stress in a dry-hot valley

Wang

Yan

et al. 2016

Bot Stud

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“…Medly. Marandu and Basilisk cultivars have high forage production potential, but are not adapted to long-term droughts (Guenni et al, 2002;Santos et al, 2013). BRS Paiaguás was recommended as a new cultivar based on its forage production and quality, particularly during the dry season, which results in improved animal production when compared to other U. brizantha cultivars .…”

Section: Plant Materialsmentioning

confidence: 99%

“…Studying different species of the genus Urochloa, Guenni et al (2002) observed that the rate of water use was higher in U. brizantha (CIAT 6780), U. decumbens (CIAT 606) and Urochloa mutica Taxa with a more resource acquisitive strategy for water use can cope with drought when soils are deeper and contain a sufficient water reserve. However, this mechanism of dehydration avoidance is risky if soil water continues to be depleted because a large photosynthetic surface is also a larger area for water loss through transpiration (Escudero, Mediavilla, & Heilmeier, 2008;Lamont, Groom, & Cowling, 2002).…”

Section: Dehydration Avoidance Strategy For Water Acquisitionmentioning

confidence: 99%

Large variability in drought survival among Urochloa spp. cultivars

Beloni

Santos

Rovadoscki

et al. 2018

Grass and Forage Science

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The Urochloa spp. cultivars are largely used for forage production in tropical and humid subtropical zones in Brazil. However, in areas of transition to drier zones, the persistence of Urochloa cultivars may be jeopardized by severe drought. We aimed to quantify and describe variability in growth potential under irrigation as well as dehydration tolerance and avoidance in cultivars under severe drought of Urochloa C4 species (Urochloa brizantha, cvs. Marandu and BRS Paiaguás and Urochloa decumbens cv. Basilisk), which were hypothesized to be less dehydration tolerant than a Mediterranean C3 species (Dactylis glomerata L. cv. Medly). Two experiments were carried out in a controlled environment—one in pots and one in long tubes—each under irrigation and drought successively. Marandu and Basilisk cultivars produced double the aerial and root biomass of cv. BRS Paiaguás. Their root systems were also deeper conferring them higher dehydration avoidance; however, they exhibited lower dehydration tolerance under severe drought. Conversely, cv. BRS Paiaguás was less productive, more dehydration tolerant and, therefore, able to survive at lower soil moisture, similar to the drought tolerant cv. Medly. The BRS Paiaguás cultivar may show sward persistence where extreme drought is experienced, but results should be confirmed under field conditions.

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“…Both natural and planted pasture lands occupy roughly 200 Mha, primarily used to feed beef cattle [3]. In this system, the forage production is essentially rainfed, in which over 80% of the yield occurs during the rainy season, thus the forage production is highly susceptible to seasonal water stress due to either waterlogging or drought [4][5][6]. Sustainable pasture management is a key element in the enhancement of productivity and reduction of the conversion of natural forests into grasslands, and consequently, the decrease of the environmental footprint of the livestock sector [7].…”

Section: Introductionmentioning

confidence: 99%

Yield Component Responses of the Brachiaria brizantha Forage Grass to Soil Water Availability in the Brazilian Cerrado

et al. 2020

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Brazil is one of the world's largest producers of beef cattle and dairy products, which requires high forage yield to attend grass-fed animals' demand. Among the grass species adopted in the forage production system in Brazil, the Brachiaria genus stands out. This genus comprises nearly 85% of all planted forage area. In general, forage production systems in Brazil are essentially rainfed, and thus susceptible to seasonal soil water stresses. Selecting the suitable Brachiaria cultivar for lands susceptible to periodic waterlogging and dry spells is crucial to enhance forage yield, and consequently, to reduce the environmental footprint of the livestock sector. In this research, we investigated the performance of three recent commercial Brachiaria brizantha cultivars (Piatã, BRS Paiaguás, and MG13 Braúna) extensively adopted in Brazil's grazing systems subjected to different ranges of soil water potential. For three cutting periods, yield related-variables (e.g., plant height, leaf area, dry biomass, and water use efficiency) were measured. Our results point to the existence of a low drought-resistant trait among cultivars, indicating the need for releasing better-adapted cultivars to cope with reduced soil water availability. All cultivars achieved higher performance at soil water pressure head between −15 kPa and −25 kPa; and in general, the cultivar. Piatã showed slightly superior results to most of the treatments.

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Cited by 94 publications

References 27 publications

Morphological and physiological responses of Heteropogon contortus to drought stress in a dry-hot valley

Morphological and physiological responses of Heteropogon contortus to drought stress in a dry-hot valley

Large variability in drought survival among Urochloa spp. cultivars

Yield Component Responses of the Brachiaria brizantha Forage Grass to Soil Water Availability in the Brazilian Cerrado

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