Use of Physiological Indices as a Screening Technique for Drought Tolerance in OilseedBrassicaSpecies

Kumar, Ashok; Singh, D. P.

doi:10.1006/anbo.1997.0573

Cited by 102 publications

(72 citation statements)

References 17 publications

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“…In domesticated B. rapa, net photosynthesis was 13.0 mmol m (2 s (1 (SE 0.36) with a stomatal resistance of 2.2 s cm (1 (SE 0.07). Similar values of stomatal conductance were reported in six B. napus and four B. rapa genotypes by Kumar and Singh (1998) with lower stomatal conductance on average in B. rapa. Uprety et al (1995) found greater chlorophyll content in B. napus (1.5 mg g (1 FW, SE 0.04) than in B. rapa (1.1 mg g (1 FW, SE 0.02).…”

Section: Historysupporting

confidence: 84%

“…In general, rooting depth and total root dry matter production were greater in B. napus than in B. rapa, and Richards and Thurling (1979) suggested that this may be due to differences in time to maturity between these species. In India, maximum soil moisture extraction was 1 to 3 cm H 2 O per 30 cm depth between 30 and 150 cm soil depth, while soil moisture extraction between 150 and 180 cm declined sharply in two B. napus and two B. rapa genotypes (Kumar and Singh 1998). In contrast, Kumar et al (1987) reported lower total moisture extraction in five domesticated B. napus genotypes (175 to 184 mm H 2 O) than in three domesticated B. rapa genotypes (186 to 215 mm H 2 O).…”

Section: Historymentioning

confidence: 96%

See 1 more Smart Citation

The Biology of Canadian Weeds. 137. Brassica napus L. and B. rapa L.

Gulden¹,

Warwick²,

Thomas³

2008

Can. J. Plant Sci.

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. 2008. The Biology of Canadian Weeds. 137. Brassica napus L. and B. rapa. Can. J. Plan Sci. 88: 951Á996. Brassica napus and B. rapa are native to Eurasia. In Canada, these species are commonly referred to as volunteer canola, while feral populations of B. rapa are referred to as birdrape. Brassica napus and B. rapa have been grown commercially for their seed oil content in western Canada since the middle of the last century and volunteer populations are common in fields. Escaped populations of both species are also found along roadways, railways and in waste areas; however, only B. rapa is known to have naturalized, self-sustaining feral populations in these habitats in eastern Canada. Despite these escaped and feral populations, B. napus and B. rapa are mainly a concern in agricultural fields where their combined relative abundance has increased over the past few decades. In the mid 1990s, herbicideresistant genotypes of B. napus were released for commercial production. Herbicide-resistance and the stacking of genes in volunteer populations conferring resistance to multiple herbicides have contributed to increased difficulties in controlling volunteer B. napus in some crops. However, yield loss resulting from volunteer populations is not well documented in Canada.Key words: Brassica napus, Brassica rapa, herbicide resistance, transgene escape, volunteer canola, weed biology Gulden, R. H., Warwick, S. I. et Thomas, A. G. 2008. La biologie des mauvaises herbes au Canada. 137. Brassica napus L. et B. rapa L. Can. J. Plant Sci. 88: 951Á996. Brassica napus et B. rapa sont des plantes originaires d'Eurasie. Au Canada, on les de´signe souvent sous l'expression « canola spontane´», tandis que les peuplements sauvages de B. rapa sont appele´s « navette ». Dans l'Ouest canadien, Brassica napus et B. rapa sont cultive´s commercialement pour l'huile que renferment leurs graines depuis le milieu du sie`cle dernier et les repousses spontane´es sont devenues monnaie courante dans les champs. On observe des peuplements des deux espe`ces le long des routes et des voies ferre´es ainsi que dans les terrains vagues, cependant on sait que seule B. rapa s'est acclimate´e pour donner des populations sauvages et stables dans les meˆmes habitats, dans l'est du pays. Malgre´cela, B. napus et B. rapa demeurent surtout pre´occupants dans les cultures, oul eur abondance relative, une fois combine´s, s'est accrue au cours des dernie`res de´cennies. Au milieu des anne´e 1990, des ge´notypes de B. napus re´sistants aux herbicides ont e´te´homologue´s pour la culture commerciale. Cette re´sistance et l'accumulation des ge`nes qui la codent dans les peuplements spontane´s ont concouru a`compliquer la lutte contre les repousses de B. napus dans certaines cultures. Quoi qu'il en soit, les pertes de rendement qui en re´sultent sont mal e´taye´es au Canada.

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Section: Historysupporting

confidence: 84%

Section: Historymentioning

confidence: 96%

The Biology of Canadian Weeds. 137. Brassica napus L. and B. rapa L.

Gulden¹,

Warwick²,

Thomas³

2008

Can. J. Plant Sci.

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show abstract

“…4), which are important leaf anatomical characteristics for restricting leaf water loss through cuticle transpiration under drought conditions. Osmotic adjustment also enables the plants to maintain higher tissue water content, turgor and turgor-related processes during water deficit as reported in many crop species (Morgan et al, 1986;Ritchie et al, 1990;Kumar and Singh, 1998). In this study, there was a small decrease in osmotic potential, -1.0 to -0.87 MPa with a larger decrease in leaf water potential, -0.92 to -0.65 MPa (Table 1) indicating limited or no osmotic adjustment.…”

Section: Discussionsupporting

confidence: 63%

Assessing Drought Tolerance of Snap Bean (Phaseolus Vulgaris) From Genotypic Differences In Leaf Water Relations,Shoot Growth and Photosynthetic Parameters

Omae

Kumar

Kashiwaba

et al. 2007

Plant Production Science

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“…LIMA et al (2011), ao avaliarem o crescimento desta mesma variedade de girassol ornamental em vasos e casa de vegetação, em Fortaleza-CE, sob as mesmas concentrações testadas, verificaram que uma única aplicação durante o ciclo da cultura não foi suficiente para reduzir sua altura, pressupondo-se que tal efeito tenha sido devido às altas temperaturas de Fortaleza, registradas durante o cultivo. Diante desta verificação, CUQUEL te al.…”

Section: Resultsunclassified

“…Reduzidas trocas gasosas das plantas em areia podem ter sido provocadas pelos baixos teores de nutrientes e pela capacidade de retenção de água inferior em relação ao substrato FC (Tabela 1), uma vez que as atividades fotossintéticas das plantas estão diretamente relacionadas ao conteúdo de água no meio onde estão sendo cultivadas, e plantas com um balanço nutricional adequado são eficientes em manter sua capacidade fotossintética (TAIZ & ZEIGER, 2004). KUMAR & SINGH (1998) citam que deficiências hídricas podem reduzir o potencial hídrico das plantas, causando, com isso, diminuição na turgescência, na condutância estomática e na fotossíntese, provocando redução no crescimento e na produtividade às plantas. Diante de tal afirmação, percebe-se que a retenção de água inferior apresentada pelo substrato areia, quando comparado ao FC, pode, possivelmente, ter provocado estresse hídrico nestas plantas, afetando, assim, suas trocas gasosas.…”

Section: Effects Of Daminozide Concentrations On : (A) the Number Of unclassified

Efeito do regulador daminozide e dos substratos fibra de coco e areia no cultivo em vaso de girassol ornamental

Lima¹,

Takane²,

Lacerda³

et al. 2014

Científica

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Use of Physiological Indices as a Screening Technique for Drought Tolerance in OilseedBrassicaSpecies

Cited by 102 publications

References 17 publications

The Biology of Canadian Weeds. 137. Brassica napus L. and B. rapa L.

The Biology of Canadian Weeds. 137. Brassica napus L. and B. rapa L.

Assessing Drought Tolerance of Snap Bean (Phaseolus Vulgaris) From Genotypic Differences In Leaf Water Relations,Shoot Growth and Photosynthetic Parameters

Efeito do regulador daminozide e dos substratos fibra de coco e areia no cultivo em vaso de girassol ornamental

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