Sporocarp germination, cytology and mineral nutrition of Azolla

Singh, Pawan Kumar; Patra, Rounak; Nayak, S. K.

doi:10.1007/978-94-009-6201-9_5

Cited by 7 publications

(7 citation statements)

References 3 publications

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“…These morphological distinctions are also corroborated by the reported chromosome counts: A. nilotica has a diploid karyotype of 2n = 52 (Stergianou & Fowler, 1989Saunders & Fowler, in press), whereas A . pinnata has 2n = 44 (Loyal, 1958(Loyal, , 1975Loyal et al, 1982;Singh et al, 1984;Nayak & Singh, 1989;Stergianou & Fowler, 1989Saunders & Fowler, in press). Azolla nilotica has a very simple nomenclatural history, with no synonyms.…”

Section: Interspecijic Variationmentioning

confidence: 99%

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A morphological taxonomic revision of Azolla Lam. section Rhizosperma (Mey.) Mett. (Azollaceae)

Saunders

Fowler

1992

Botanical Journal of the Linnean Society

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SAUNDERS, R. M. K. & FOWLER, K., 1992. A morphological taxonomic revision of Azolla Lam. section Rhizosperma (Mey.) Mett. (Azollaceae). Recent research on the agronomically important aquatic fern Azolla has been hampered by the lack of a sound taxonomic framework. The classification of section Rhizosperma is revised using multivariate statistical analyses of ultrastructural, gross morphological and anatomical characters. The disparate morphologies and current delimitations of A. pinnata and A. nilotica are corroborated. Three distinct geographically related subspecies of A. pinnata are identified and formally named and described as: 1. subsp. pinnata, occurring in northern and eastern Australia and New Caledonia; 2. subsp. asiatica subsp. nov., occurring in India, southern China, south‐east Asia and southern Japan; and 3. subsp. africana stat. et comb, nov., occurring in tropical Africa and Madagascar. A sequential dichotomous key is provided for the identification of taxa, with new taxonomic descriptions.

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Section: Interspecijic Variationmentioning

confidence: 99%

“…Palaeobot. Palyn.,39 : 1 1 1 (1983); Ashton 349 CHROMOSOME NUMBER: n = 22 (Loyal, 1958); 2n = 44 (Loyal, 1975;Loyal et al, 1982;Singh et al, 1984;Nayak & Singh, 1989;Stergianou & Fowler, 1989Saunders & Fowler, in press 39: 185 (1925). A .…”

Section: Intraspecijic Variationmentioning

confidence: 99%

A morphological taxonomic revision of Azolla Lam. section Rhizosperma (Mey.) Mett. (Azollaceae)

Saunders

Fowler

1992

Botanical Journal of the Linnean Society

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“…The split application of P is likely to provide a continuous supply of soluble P. When P was applied as a single dose, more was available initially to the Azolla, but on longer incubation, this phosphorus may get fixed in soil . The decreased Azolla growth and ARA in this treatment was due possible to lower availability of P. Watanabe et al (1980) and Singh et al (1984) reported that P is readily fixed in the soil and becomes non-available to Azolla . Application of 4.44 kg P ha -' in two equal splits increased Azolla biomass and N yield by 41 .5 and 72.9%x , respectively, in dual cropping with rice (Singh & Singh, 1985).…”

Section: Discussionmentioning

confidence: 99%

“…pinnata in fallow fields (Watanabe, 317 1982) were obtained with split application of 6.66 kg P ha -', while increase in P level to 13 .33 kg ha -' did not increase productivity and N gain. Singh et al (1984) reported that Azolla biomass was more in split application than in single application of P . …”

Section: Discussionmentioning

confidence: 99%

“…Deficiency in P has pronouced effect on growth, N 2fixation (Singh, 1979a,b) and split application of P is considered better than a single application (Watanabe et al, 1980 ;Singh et al, 1984). Detailed comparative studies on acetylene reducing activity and heterocyst frequency in different leaves of Azolla species according to P treatment are lacking .…”

Section: Introductionmentioning

confidence: 99%

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Symbiotic algal nitrogenase activity and heterocyst frequency in sevenAzolla species after phosphorus fertilization

Singh

1988

Hydrobiologia

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Seven species of Azolla (A . caroliniana, A . microphylla, A. nilotica, A . filiculoides, A . mexicana, A. rubra, A . pinnata the last from both Malaysia and India) grown in pots of flooded soil were subjected to three different treatments with respect to P : none, single application, split application . The experiments were carried out under greenhouse conditions . Heterocyst frequency in Anabaena azollae and acetylene reducing activity (ARA) were studied in successive Azolla leaves . Both variables increased from the first leaf (shoot apex) to the last one (before branch) in all species in the presence or absence of P . However, heterocyst frequency, ARA and Azolla biomass were all less in the treatment lacking P . Heterocyst frequency in A. azollae, ARA and biomass of Azolla were higher when P was applied in split doses than in the other treatments . Azolla plants exhibited more ARA than the isolated leaves .

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The influence of fertilizers on sporocarp formation inAzolla pinnata

Singh

Pandey

1987

Proc. Indian Acad. Sci. (Plant Sci.)

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Sporocarp germination, cytology and mineral nutrition of Azolla

Cited by 7 publications

References 3 publications

A morphological taxonomic revision of Azolla Lam. section Rhizosperma (Mey.) Mett. (Azollaceae)

A morphological taxonomic revision of Azolla Lam. section Rhizosperma (Mey.) Mett. (Azollaceae)

Symbiotic algal nitrogenase activity and heterocyst frequency in sevenAzolla species after phosphorus fertilization

The influence of fertilizers on sporocarp formation inAzolla pinnata

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