Causes of Partial Male Sterility in an Inbred Maize Line.

Defani-Scoarize, Marli Aparecida; Pagliarini, Maria Suely; Aguiar, Celso Gonçalves de

doi:10.1508/cytologia.60.311

Cited by 17 publications

(15 citation statements)

References 15 publications

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“…This irregularity was widely observed in inbred lines of maize (Pagliarini, 1983(Pagliarini, , 1989Pagliarini et al, 1986;Defani-Scoarize et al, 1995a,b, 1996, Chlorophytum comosum , sugarcane (Pagliarini et al, 1990), Bougainvillea (Adamowski et al, 1996), Aloysia lycioides (CorazzaNunes et al, 1993(CorazzaNunes et al, , 1995, Hevea brasiliensis (Pagliarini et al, 1992a), Ochna sp. (Pagliarini et al, 1992b), Pilocarpus pennatifolius (Pagliarini and Pereira, 1992), Aptenia cordifolia (Pagliarini, 1990a), Centella asiatica (Consolaro and Pagliarini, 1996a), Brassica napus and B. campestris , and in many Paspalum species (Freitas et al, 1997;Adamowski et al, 1999).…”

Section: Resultsmentioning

confidence: 85%

“…In Paspalum, only dyads and triads were formed, and there was no cytokinesis at the end of the first meiosis. Abnormal spindles were found in Thunbergia mysorensis (Pagliarini, 1990b), Ochna (Pagliarini et al, 1992b), Aloysia lyciodes (Corazza-Nunes et al, 1993), maize (Defani-Scoarize et al, 1995a,b, 1996Caetano-Pereira et al, 1998b), and canola (Souza et al, 1999). Abnormal spindles are also an important meiotic irregularity, because depending on its shape, the spindle can rejoin or split the chromosome complement.…”

Section: Resultsmentioning

confidence: 99%

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Meiotic behavior of economically important plant species: the relationship between fertility and male sterility

2000

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Meiosis is an event of high evolutionary stability which culminates in a reduction of chromosome number. The normal and harmonious course of meiosis ensures gamete viability. The cytologic events of gametogenesis are controlled by a large number of genes that act from premeiotic to postmeiotic mitosis. Mutations in these genes cause anomalies that may impair fertility, and many abnormalities affecting plant fertility or causing total male sterility have been detected during the evaluation of meiotic behavior in some species. Some of these abnormalities have been frequently described in the literature, while others have not been previously reported. The most frequent abnormalities found in the species analyzed were irregular chromosome segregation, cytomixis, chromosome stickiness, mixoploidy, chromosome fragmentation, syncyte formation, abnormal spindles, and failure of cytokinesis. Uncommon abnormalities, such as chromosome elimination during microsporogenesis, were found in one species. Original meiotic mutations affecting different steps of meiosis were also observed in these species, especially in maize, Paspalum and soybean. Some mutants present characteristics that may be exploited successfully in breeding programs because they cause total male sterility.
A meiose é um evento de alta estabilidade evolucionária que culmina na redução do número de cromossomos. O curso normal e harmonioso da meiose garante a viabilidade gamética. Os eventos citológicos da gametogênese são controlados por um grande número de genes que atuam desde as mitoses pré-meióticas até as pós-meióticas. Mutações nestes genes causam anomalias que podem afetar a fertilidade. Durante a avaliação do comportamento meiótico em algumas espécies de plantas, muitas anormalidades que afetaram a fertilidade ou causaram total macho-esterilidade foram detectadas. Algumas das anormalidades encontradas já eram descritas na literatura, enquanto outras eram totalmente desconhecidas. As anormalidades mais freqüentes nas espécies analisadas foram segregação irregular de cromossomos, citomixia, aderências cromossômicas, mixoploidia, fragmentação cromossômica, formação de sincícios, fusos anormais e falta de citocinese. Eliminação de cromossomos, uma anormalidade meiótica rara, foi observada em uma espécie de Paspalum. Mutantes meióticos nunca antes descritos, afetando diferentes passos da meiose, foram observados em algumas espécies, especialmente em milho, soja e Paspalum. Alguns mutantes apresentam características que podem ser exploradas com sucesso em programas de melhoramento, pois causam total macho-esterilidade

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Meiotic behavior of economically important plant species: the relationship between fertility and male sterility

2000

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“…Chiasmata are responsible for the maintenance of the bivalents which permit normal chromosome segregation and the process ensures the pollen fertility (Pagliarini 1990, Defani Scoarize et al 1995a, b, Consolaro et al 1996. Other segregational abnormalities like non oriented bivalents and laggards leads to the formation of micronucleus (Koduru and Rao 1981).…”

Section: Discussionmentioning

confidence: 99%

Seed Yield is not Impaired by Chromosome Stickiness in Sodium Azide Treated Trigonella foenum-graecum

Srivastava

Kapoor

2008

cytologia

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Summary Partial or complete stickiness of chromosomes and disorientation of spindle were the major anomalies observed in meiocytes of Trigonella plants raised from seeds treated with different concentration of sodium azide for three durations. Other aberrations were unequal separation, non synchronous division, bridge, laggard, stray etc. The pollen fertility and yield showed an increase over control despite the high frequency of stickiness and spindle disorientation. Yield was positively correlated with stickiness, indicating a balancing/regulatory effect of stickiness at the time of gamete formation. Meiosis, an event of high evolutionary stability, plays a dual role as it halves the chromosome number in order to maintain ploidy level after fertilization and also ensures viability of gametes. It is a major event in the life cycle of any individual and a normal and harmonious completion of the cytological action is controlled by large number of genes, which act from pre-meiotic to post-meiotic stage. Mutation in these genes causes abnormalities that may or may not impair pollen fertility. Key wordsCytological studies constitute an important component in a breeding program involving the development of new original forms with the aid of experimental mutagenesis. The normal and harmonious course of meiosis ensures gamete viability, which if altered has a significant affect on the yield. The objective of this work was to study the meiotic behavior in pollen mother cells of sodium azide treated Trigonella foenum-graecum plants. The different concentrations of sodium azide caused meiotic abnormalities in high numbers, but surprisingly did not affect the pollen fertility and yield. The yield was significantly increased at some doses, contrary to the belief that aberration leads to abnormal gametes and hence low yield. Sodium azide has been reported to induce large variability for several characters viz. number of capsules per plant, number of seeds per capsule, size of the seeds and weight of 100 seeds in Capsicum annuum and mutants also exhibited high germination percentage and vigour over parental variety (Umalkar et al. 1981). The suitability of sodium azide, as a mutagen for T. foenum-graecum was investigated by assessing the type of cytological anomalies and correlating it with the seed yield per plant. Materials and methodsDuring our investigation, uniform sized seeds were treated with 0.10%, 0.15%, 0.20% and 0.25% freshly prepared sodium azide solution (pHϭ4), each for different durations (2 h, 4 h and 6 h) and the treated seeds after proper washing were sown along with control in pots. For meiotic studies, flower buds were taken from plants of each treatment. Appropriate sized flower buds were fixed in 1 : 3 iron saturated acetic acid and absolute alcohol for 24 h and there after transferred to 70% alcohol. Slides were prepared by squashing the anthers in Acetocarmine stain, gently heated to

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“…Defani-Scoarize et al (1995) associated the occurrence of male sterility in maize to the action of meiotic abnormalities of the univalent chromosome type, followed by irregular chromosome segregations. In all genotypes analyzed, these alterations, as well as the tetravalent ring (Figure 1-F), all contributed to the formation of aneuploids, i.e., unbalanced and normally unviable gametes.…”

Section: Resultsmentioning

confidence: 99%

Pollen viability and meiotic analysis of Solanum commersonii commersonii Dun., Solanum commersonii malmeanum Bitt. and Solanum tuberosum L.

Tomé¹,

Davide²,

Pinto³

et al. 2007

CBAB

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-Meiotic abnormalities in potato hamper sexual recombination, due to their influence on pollen production and viability rate. In this study we evaluated pollen viability and meiosis of three clones of Solanum commersonii commersonii Dun. (SCC), two of Solanum commersonii malmeanum Bitt. (SCM) and seven clones and four cultivars of Solanum tuberosum L., with the purpose of indicating promising genotypes for genetic breeding of potato. Early chromosome migration at metaphases I and II and chromosome pairing anomalies were the main causes of pollen inviability in the evaluated genotypes. Clones SCC 07 and SCM 60 are the most suitable for sexual recombination, owing to the high percentage of viable pollen grains and low frequencies of meiotic abnormalities.

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Causes of Partial Male Sterility in an Inbred Maize Line.

Cited by 17 publications

References 15 publications

Meiotic behavior of economically important plant species: the relationship between fertility and male sterility

Meiotic behavior of economically important plant species: the relationship between fertility and male sterility

Seed Yield is not Impaired by Chromosome Stickiness in Sodium Azide Treated Trigonella foenum-graecum

Pollen viability and meiotic analysis of Solanum commersonii commersonii Dun., Solanum commersonii malmeanum Bitt. and Solanum tuberosum L.

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