Waterlogging responses of Sporobolus virginicus (L.) Kunth.

Naidoo, G.; Naidoo, S.

doi:10.1007/bf00317704

Cited by 55 publications

(38 citation statements)

References 24 publications

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“…Even in flood-tolerant grasses this response is typical (Naidoo & Naidoo, 1992;Naidoo & Mundree, 1993;Baruch, 1994a;Loreti & Oesterheld, 1996). The reason for that is because, in general, anoxia is fatal to all roots, even in anoxia tolerant species (Crawford & Braendle, 1996).…”

Section: Biomass Allocation and Growthmentioning

confidence: 99%

Physiological and morphological responces of Brachiaria spp. to flooding

Dias‐Filho

Carvalho

2000

Pesq. agropec. bras.

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-The physiological and morphological responses of the forage grasses Brachiaria brizantha cv. Marandu, B. decumbens and B. humidicola were compared for plants grown in pots under flooding and well-drained conditions for 14 days. Flooding reduced specific leaf area and biomass allocation to roots in all species and enhanced leaf senescence in B. brizantha and B. decumbens. Relative growth rate was reduced by flooding in B. brizantha and B. decumbens, but not in B. humidicola. Leaf elongation rate was unaffected by flooding in B. decumbens and B. humidicola, but declined in B. brizantha since the first day of flooding. Net photosynthesis and leaf chlorophyll content were reduced by flooding in B. brizantha; however, no flooding effect could be detected in the other two species. For all species, there was a close relationship between net photosynthesis and stomatal conductance under flooding. These results show that the studied species have distinct degrees of tolerance to flood, B. brizantha is intolerant, B. decumbens is moderately tolerant and B. humidicola is tolerant. Because leaf elongation rate was immediately depressed by flooding only in B. brizantha, this measurement could be appropriate as an early detection mechanism for relative flood tolerance in Brachiaria spp.Index terms: Brachiaria brizantha, Brachiaria decumbens, Brachiaria humidicola, leaf area, chlorophyll, photosynthesis, biomass, growth rate.RESPOSTAS MORFOLÓGICAS E FISIOLÓGICAS DE BRACHIARIA SPP. AO ALAGAMENTO DO SOLO RESUMO -As respostas morfológicas e fisiológicas de Brachiaria brizantha cv. Marandu, B. decumbens e B. humidicola foram comparadas em plantas cultivadas em vasos, sob solo alagado e bem drenado durante 14 dias. O alagamento reduziu a área foliar específica e a alocação de biomassa para as raízes em todas as três espécies e aumentou a senescência foliar em B. brizantha e B. decumbens. O alagamento reduziu a taxa de crescimento relativo em B. brizantha e B. decumbens, mas não em B. humidicola. A taxa de elongação foliar não foi afetada pelo alagamento em B. decumbens e B. humidicola, mas diminuiu em B. brizantha desde o primeiro dia de alagamento. A fotossíntese líquida e o conteúdo de clorofila foliar foram reduzidos pelo alagamento em B. brizantha; no entanto, nenhum efeito do alagamento pôde ser detectado nas outras espécies. Em todas as espécies, existiu uma estreita relação entre as taxas de fotossíntese líquida e a condutância estomatal. Esses resultados mostram que as espécies estudadas diferem quanto à tolerância ao alagamento. B. brizantha é intolerante, B. decumbens é moderadamente tolerante e B. humidicola é tolerante. Em virtude de a taxa de elongação foliar ter sido imediatamente afetada somente em B. brizantha, este parâmetro pode ser empregado como um mecanismo de detecção prematura da tolerância ao alagamento em Brachiaria spp.Termos para indexação: Brachiaria brizantha, Brachiaria decumbens, Brachiaria humidicola, área foliar, clorofila, fotossíntese, biomassa, taxa de crescimento.

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Section: Biomass Allocation and Growthmentioning

confidence: 99%

Physiological and morphological responces of Brachiaria spp. to flooding

Dias‐Filho

Carvalho

2000

Pesq. agropec. bras.

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“…Even grass species with a known tolerance to flooding show a shift in carbon allocation from below-to above-ground components under flooding (Naidoo & Naidoo, 1992;Naidoo & Mundree, 1993;Baruch, 1994a;Loreti & Oesterheld, 1996;Dias-Filho & Carvalho, 2000). The reason for that is the deleterious effect flooding has on root formation and growth and the induction of root decay it causes (Kozlowski, 1997).…”

Section: Treatment Lmr Cmr Rmr ------------------------(Kg Kg -1 )---mentioning

confidence: 99%

Tolerance to flooding in five Brachiaria brizantha accessions

Dias‐Filho

2002

Pesq. agropec. bras.

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Some physiological and morphological responses of five Brachiaria brizantha accessions (BRA000591 cultivar Marandu, BRA003441, BRA002844, BRA004308 and BRA004391) were compared for plants grown in pots under flooding and well-drained conditions for 14 days. Flooding caused a significant reduction in leaf dry mass production in all accessions, but, for root biomass, no differences between treatments could be detected in BRA003441 and BRA004391. No adventitious root production was observed in flooded BRA003441; all other accessions produced adventitious roots when flooded. Relative growth rate was reduced by flooding only in BRA000591 and BRA004308. Leaf elongation rate was reduced by flooding in all accessions, however, more severely in BRA003441. Net photosynthesis was reduced by flooding in all accessions, but with less intensity in BRA004391. For all accessions, there was a close relationship between net photosynthesis and stomatal conductance under flooding. The five accessions tested differed in tolerance to flooding. BRA004391 was the most tolerant. Accession BRA003441 was the most sensitive, followed by BRA000591 cultivar Marandu. Accessions BRA002844 and BRA004308 were classified as intermediate in flooding tolerance.Index terms: adventitious roots, photosynthesis, forage grasses, biomass allocation, growth rate. Tolerância ao alagamento em cinco acessos de Brachiaria brizanthaResumo Algumas respostas morfológicas e fisiológicas de cinco acessos de Brachiaria brizantha (BRA000591 cultivar Marandu, BRA003441, BRA002844, BRA004308 e BRA004391) foram comparadas em plantas cultivadas em vasos, sob condições de solo alagado e bem drenado, durante 14 dias. O alagamento reduziu significativamente a produção de massa seca foliar em todos os acessos, mas para a massa seca radicular, não foi possível encontrar diferenças entre tratamentos em BRA003441 e BRA004391. Somente BRA003441 não produziu raízes adventícias sob alagamento. A taxa de crescimento relativo foi reduzida pelo alagamento somente em BRA000591 e BRA004308. A taxa de elongação foliar foi reduzida pelo alagamento do solo em todos os acessos, porém, com maior severidade em BRA003441. O alagamento reduziu a fotossíntese líquida em todos os acessos, porém, menos intensamente em BRA004391. Em todos os acessos encontrou-se uma estreita relação entre as taxas de fotossíntese líquida e a condutância estomática sob alagamento. Os cinco acessos testados diferiram na sua tolerância relativa ao alagamento do solo. BRA004391 foi o mais tolerante. O acesso BRA003441 foi o menos tolerante, seguido por BRA000591 cultivar Marandu. Os acessos BRA002844 e BRA004308 foram considerados como intermediários em tolerância ao alagamento do solo.Termos para indexação: raízes adventícias, fotossíntese, gramíneas forrageiras, alocação de biomassa, taxa de crescimento.

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“…the culm and leaf surfaces showed salt deposition. Naidoo and Naidoo (1992) studied morphological and physiological responses of S. virginicus to flooding. Because of this condition, morphological changes in flooded roots and rhizomes appeared, by increasing air space volume.…”

Section: Discussionmentioning

confidence: 99%

Morphometric Variations in Caryopses and Seedlings of Two Grass Species Growing Under Contrasting Habitats

Gandhi

Albert

2015

Not Sci Biol

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Urochondra setulosa grows in marine conditions, while Sporobolus indicus grows near fresh water and sometimes also close to moist places along roadside areas. Both species belong to the same tribe and same family. The two grass species growing under different habitats showed characteristic variations in their morphometric traits of the caryopsis and seedlings. U. setulosa growing in salty area had characteristic features, e.g. leaf and culm with salt deposition, rigid leaf blade with pointed leaf tip, while S. indicus growing near fresh water showed glabrous nodes and internodes. Morphometric analysis of caryopses of both species showed very similar features, without prominent differences in their length, breadth and thickness. But light microscopy and scanning electron microscopic (SEM) studies showed variations. Under light microscopy, features like colour, shape and compression of caryopses showed differences among the species. SEM studies of caryopses revealed a reticulate type of pattern of sculpturing on both dorsal and ventral surfaces, whereas anticlinal and periclinal walls in U. setulosa were elevated with folded walls, while in S. indicus had non elevated undulating walls. In conclusion, each individual grass ecotype evolves some characteristic morphological features to thrive well under a particular environment. Both species studied hereby, grown in different habitats, showed remarkable differentiations in their characters, thus indicating that habitats play a major role in traits of the plant growth.

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Waterlogging responses of Sporobolus virginicus (L.) Kunth.

Cited by 55 publications

References 24 publications

Physiological and morphological responces of Brachiaria spp. to flooding

Physiological and morphological responces of Brachiaria spp. to flooding

Tolerance to flooding in five Brachiaria brizantha accessions

Morphometric Variations in Caryopses and Seedlings of Two Grass Species Growing Under Contrasting Habitats

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