Role of water stress in differential aluminum tolerance of two barley cultivars grown in an acid soil

Krizek, Donald T.; Foy, C. D.

doi:10.1080/01904168809363808

Cited by 30 publications

(19 citation statements)

References 30 publications

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“…Seminal (axial) root growth was more resistant to soil acidity than other components of the root system, and this appears to be particularly important in moisture-limited environments where survival of perennial species depends upon establishing their roots in moist subsoil before the onset of drought conditions. Indeed, drier conditions exacerbate differences between acid-soil sensitive and resistant genotypes, with the better root growth of acid-soil resistant genotypes aiding water extraction (Krizek and Foy 1988;Tang et al 2002). Survival of sensitive species such as tall wheatgrass, for which the seminal root length was restricted in all three soils, is often compromised in the field (Culvenor et al 2004).…”

Section: Implications Of Responses For the Fieldmentioning

confidence: 99%

Root morphology, root-hair development and rhizosheath formation on perennial grass seedlings is influenced by soil acidity

et al. 2010

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Perennial pasture species are important for sustainable pasture systems; yet some species display poor persistence on acid soils. This work investigated the effect of soil acidity on primary root length and root-hair and rhizosheath development of five perennial grass genotypes varying in acid-soil resistance. Plants were grown in three low-P acid soils that were limed (CaCO 3 ) to modify soil pH (0.01 M CaCl 2 extractable) from <4.3 to >5.0 and Al 3+ concentrations from ≥ 16 to <4 mg kg −1 (0.01 M CaCl 2 extractable). Root morphology of tall wheatgrass (Thinopyrum ponticum (Podp.) Z.-W. Liu & R.-C Wang), phalaris (Phalaris aquatica L.), cocksfoot (Dactylis glomerata L.) and weeping grass (Microlaena stipoides Labill. R. Br.) was assessed after 20-25 days growth. The root length of tall wheatgrass and phalaris cv Sirosa was sensitive to acidity, with lateral root length more sensitive to acidity than seminal root length. Lime increased the root-hair length and density of both acid-soil sensitive and resistant genotypes (cocksfoot and an acidresistant line of phalaris) and root-hair length was positively correlated to an increase in rhizosheath size per unit root length. Restricted root length and poor root-soil contact of acid-soil sensitive genotypes may explain their low yield and relatively poor persistence on acid soils. The improvement to root-hair and rhizosheath development of genotypes that are acidsoil resistant in terms of root length demonstrates the benefit of using resistant genotypes in conjunction with liming to manage acid soils. Weeping grass was exceptional in its ability to maintain root length, roothair and rhizosheath development in acid soil.

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Section: Implications Of Responses For the Fieldmentioning

confidence: 99%

Root morphology, root-hair development and rhizosheath formation on perennial grass seedlings is influenced by soil acidity

et al. 2010

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“…In Scots pine and Norway spruce, water deficit more strongly reduced the root elongation-rate and numbers of growing roots in a soil with pH 3.8 and high levels of Al than in a pH 5.9 soil and lower Al levels (Bartsch 1987). Krizek and Foy (1988a) and Krizek et al (1988) observed that drought exacerbated the effects of Al toxicity in plants, and increasing the soil-moisture level reduced Al toxicity in barley (Hordeum vulgare L.) and sunflower (Helianthus annuus L.). Schier and McQuattie (2000) found that at low soil moisture the growth of ectomycorrhizal pitch pine (Pinus rigida Mill.)…”

Section: Root-growth Response Of Plants To Aluminium Toxicity and Dromentioning

confidence: 99%

Interaction of aluminium and drought stress on root growth and crop yield on acid soils

2013

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Background Aluminium (Al) toxicity and drought stress are two major constraints for crop production in the world, particularly in the tropics. The variation in rainfall distribution and longer dry spells in much of the tropics during the main growing period of crops are becoming increasingly important yield-limiting factors with the global climate change. As a result, crop genotypes that are tolerant of both drought and Al toxicity need to be developed. Scope The present review mainly focuses on the interaction of Al and drought on root development, crop growth and yield on acid soils. It summarizes evidence from our own studies and other published/related work, and provides novel insights into the breeding for the adaptation to these combined abiotic stresses. The primary symptom of Al phytotoxicity is the inhibition of root growth. The impeded root system will restrict the roots for exploring the acid subsoil to absorb water and nutrients which is particularly important under condition of low soil moisture in the surface soil under drought. Whereas drought primarily affects shoot growth, effects of phytotoxic Al on shoot growth are mostly secondary effects that are induced by Al affecting root growth and function, while under drought stress root growth may even be promoted. Much progress has recently been made in the understanding of the physiology and molecular biology of the interaction between Al toxicity and drought stress in common bean (Phaseolus vulgaris L.) in hydroponics and in an Al-toxic soil. Conclusions Crops growing on acid soils yield less than their potential because of the poorly developed root system that limits nutrient and water uptake. Breeding for drought resistance must be combined with Al resistance, to assure that drought resistance is expressed adequately in crops grown on soils with acid Al-toxic subsoils.

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“…Aluminum toxicity inhibits root cell division and elongation, thus reducing water and nutrient uptake and grain yield (Reid, 1971;Alam, 1981;Foy, 1983). Reduced drought tolerance, winter hardiness, and disease resistance have been indirectly associated with Al toxicity (Foy, 1984;Krizek & Foy, 1988). In Brazil, where toxic levels of Al occur in over half of the agricultural areas (Iturri Larach & Camargo, 1976), barley production is limited to limed soils.…”

Section: Análise Genética Da Tolerância Ao Alumínio Em Cevadas Brasilmentioning

confidence: 99%

Genetic analysis of aluminum tolerance in Brazilian barleys

Minella

Sorrells

2002

Pesq. agropec. bras.

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-Aluminum (Al) toxicity is a major factor limiting barley growth in acid soils, and genotypes with adequate level of tolerance are needed for improving barley adaptation in Brazil. To study the inheritance of Al tolerance in Brazilian barleys, cultivars Antarctica 1, BR 1 and FM 404 were crossed to sensitive Kearney and PFC 8026, and intercrossed. Parental, F 1 , F 2 and F 6 generations were grown in nutrient solution containing 0.03, 0.05 and 0.07 mM of Al and classified for tolerance by the root tip hematoxylin staining assay. Tolerant by sensitive F 2 progenies segregated three tolerant to one sensitive, fitting the 3:1 ratio expected for a single gene. The F 6 populations segregated one tolerant to one sensitive also fitting a monogenic ratio. The F 2 seedlings from crosses among tolerant genotypes scored the same as the parents. Since the population size used would allow detection of recombination as low as 7%, the complete absence of Al sensitive recombinants suggests that tolerance in these cultivars is most probably, controlled by the same gene. Thus, the potential for improving Al tolerance through recombination of these genotypes is very low and different gene sources should be evaluated.Index terms: Hordeum vulgare, genotypes, genetic inheritance, toxicity. Análise genética da tolerância ao alumínio em cevadas brasileirasResumo -A toxicidade do alumínio (Al) é um dos principais limitantes ao crescimento da cevada em solos ácidos, e são necessários genótipos com adequada tolerância para melhorar a adaptação da espécie no Brasil. Para estudar a herança da tolerância ao Al em cevadas brasileiras, as cultivares Antarctica 1, BR 1 e FM 404 foram cruzadas com Kearney e PFC 8026 e intercruzadas entre si. Progenitores e gerações F 1 , F 2 e F 6 foram cultivados em solução nutritiva contendo 0,03, 0,05 e 0,07 mM de Al, e classificadas quanto à tolerância, pelo método de coloração com hematoxilina. As progênies F 2 , das cruzas tolerante x suscetível, segregaram na proporção de três tolerantes para uma suscetível, enquadrando-se na proporção 3:1 esperada no modelo monogênico. As populações F 6 segregaram uma tolerante para uma suscetível, enquadrando-se no modelo de um gene. Nos cruzamentos entre tolerantes, as F 2 apresentaram reação igual à dos progenitores. Como o tamanho de população usado permitiria detectar recombinações de 7% na hipótese de mais de um gene ligados em repulsão, a ausência completa de segregantes suscetíveis sugere que a tolerância destas cultivares seja condicionada pelo mesmo gene. Desta maneira, o potencial para melhoria da tolerância ao Al por meio da recombinação destas cultivares é muito baixo, e devem ser pesquisadas fontes diferentes.Termos para indexação: Hordeum vulgare, genótipos, herança genética, toxicidade.

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Role of water stress in differential aluminum tolerance of two barley cultivars grown in an acid soil

Cited by 30 publications

References 30 publications

Root morphology, root-hair development and rhizosheath formation on perennial grass seedlings is influenced by soil acidity

Root morphology, root-hair development and rhizosheath formation on perennial grass seedlings is influenced by soil acidity

Interaction of aluminium and drought stress on root growth and crop yield on acid soils

Genetic analysis of aluminum tolerance in Brazilian barleys

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