Morphologie und physiologie des formwechsels der moose auf genetischer grundlage. I

Wettstein, Fritz von

doi:10.1007/bf01762372

Cited by 108 publications

(42 citation statements)

References 32 publications

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“…This contrasts with sporophyte regeneration in higher plants, but corresponds to observations with archegoniate organ explants (beginning with v. Wettstein, 1924).…”

Section: Discussioncontrasting

confidence: 69%

Gametophyte Regeneration and Apospory from Archegoniate Protoplasts Under Conditions Devised for Higher Plants*

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Mordhorst

1991

Botanica Acta

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“…This contrasts with sporophyte regeneration in higher plants, but corresponds to observations with archegoniate organ explants (beginning with v. Wettstein, 1924).…”

Section: Discussioncontrasting

confidence: 69%

Gametophyte Regeneration and Apospory from Archegoniate Protoplasts Under Conditions Devised for Higher Plants*

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Mordhorst

1991

Botanica Acta

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“…On the other hand, genic factors must contribute to the F 1 inviability in crosses between Polytrichum commune and P. uliginosum, because the phenotype is evident in premeiotic sprorophyte tissues (Van Der Velde and Bijlsma 2004). Apart from these few examples, the genetic basis of hybrid sterility or inviability in the majority of natural (Anderson and Lemmon 1972;Natcheva and Cronberg 2007) or experimentally produced (Wettstein 1924(Wettstein , 1928(Wettstein , 1932 hybrids in mosses is equivocal.…”

mentioning

confidence: 99%

The Genetic Basis of Developmental Abnormalities in Interpopulation Hybrids of the Moss Ceratodon purpureus

2008

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Divergent populations are intrinsically reproductively isolated when hybrids between them either fail to develop properly or do not produce viable offpring. Intrinsic isolation may result from Dobzhansky-Muller (DM) incompatibilities, in which deleterious interactions among genes or gene products lead to developmental problems or underdominant chromosome structure differences between the parents. These mechanisms can be tested by studying marker segregation patterns in a hybrid mapping population. Here we examine the genetic basis of abnormal development in hybrids between two geographically distant populations of the moss Ceratodon purpureus. Approximately half of the hybrid progeny exhibited a severely reduced growth rate in early gametophyte development. We identified four unlinked quantitative trait loci (QTL) that interacted asymmetrically to cause the abnormal development phenotype. This pattern is consistent with DM interactions. We also found an excess of recombination between three marker pairs in the abnormally developing progeny, relative to that estimated in the normal progeny. This suggests that structural differences in these regions contribute to hybrid breakdown. Two QTL coincided with inferred structural differences, consistent with recent theory suggesting that rearrangements may harbor population divergence alleles. These observations suggest that multiple complex genetic factors contribute to divergence among populations of C. purpureus.

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“…The causative factors are presumed to be the reduced rate of cell division (Wettstein 1924, Eigsti 1947 and reduction in the rate of metabolic activities (Larsen 1943, Schwanitz 1951. A sharp increase in the size of stomata, both in length and breadth, is attributed to the increase in the cell size.…”

Section: Discussionmentioning

confidence: 99%

Cytomorphological studies of Trigonella foenum-graecum autotetraploids in three (C1,C2,C3) generation.

1988

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Successful induction of polyploidy using colchicine is a well established phenomenon and still remains a potential cytological technique to induce numerical variations in plants. Since the discovery of Blakslee and Avery in 1937 about the chromosome doubling property of colchicine, enormous number of papers have been published on colchicine induced polyploidy. However, this technique was found to be more promising in popular ornamentals and veg etatively propagated plants. But, for some unknown reasons, induction of polyploidy in legumes was found rather difficult. A review of literature reveals that very few reports on suc cessful induction of polyploidy in legumes (Sen and Chedda 1958, Biswas and Bhattacharya 1971, Singh and Roy 1971, Gupta and Gupta 1975, 1976, Raghuvanshi and Singh 1977, Singh and Gopal 1979 are available in comparison to large number of reports on popular ornamentals Jalil et al. 1974, Arora 1975, Zadoo et al. 1975, Srivastav and Raina 1981, Rao et al. 1982.Trigonella foenum-graecum (commonly known as "Methi" or "Fenugreek") of family Leguminosae and subfamily Papilionaceae, is extensively grown in tropical and subtropical regions of India for its vegetable value and seeds which are medicinally important. The present study was undertaken in a view to study the cytomorphological features of T. foenum -graecum polyploids in successive generations and to explore the possibility of evolving a high yielding variety in terms of vegetable value and improved seed-set. Material and methodsSeeds of T. foenum-graecum used for colchicinization were obtained from Central Arid Zone Research Institute, Jodhpur.For colchicinization three methods viz. seed treatment, cotton-swab and cotyledonary leaves immersion methods were tried. The treatment was carried out for 12 or 18 hrs spread over 2 or 3 days with 0.15% colchicine (Sigma). For meiotic analysis buds were collected and fixed in iron acetic-alcohol overnight. Anthers stained in leucobasic-fuchsin were squashed in 1% aceto-carmine. Microphotographs were taken from temporary preparations. ObservationsOf the all the three methods employed, successful induction of polyploidy was achieved mainly by cotton swab method and partially by cotyledonary leaves immersion method (Table 1). Seed germinated after the treatment. Out of seventy seedlings treated by cotton-swab method with 0.15% colchicine for 12 or 18 hrs equally spread over three days, six were cyto logically confirmed as autotetraploids. Only one out of 22 seedlings treated for 10 hrs by cotyledonary leaves immersion method was found to be autotetraploid on cytological analysis.Swelling of the apical region of the seedlings was the immediate effect of coichinization,

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Morphologie und physiologie des formwechsels der moose auf genetischer grundlage. I

Cited by 108 publications

References 32 publications

Gametophyte Regeneration and Apospory from Archegoniate Protoplasts Under Conditions Devised for Higher Plants*

Gametophyte Regeneration and Apospory from Archegoniate Protoplasts Under Conditions Devised for Higher Plants*

The Genetic Basis of Developmental Abnormalities in Interpopulation Hybrids of the Moss Ceratodon purpureus

Cytomorphological studies of Trigonella foenum-graecum autotetraploids in three (C1,C2,C3) generation.

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