Détermination de la valeur culturale des semences par la radiographie industrielle aux rayons X. Application aux pépins de pommier (Malus pumila Mill.)

Chavagnat, A.; Lezec, M. Le

doi:10.1051/agro:19850213

Cited by 10 publications

(4 citation statements)

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“…Even though X-rays are potentially harmful to seeds, the low rate that is absorbed during the test is not sufficient to induce genetic mutations and does not affect their germination (Simak & Gustafsson, 1953;Swaminathan & Kamra, 1961;Chavagnat & Le Lezec, 1985;Bino et al, 1993). In addition, it is a test that does not require previous seed treatment, with the advantages of being nondestructive, quick and easy-toperform.…”

Section: Introductionmentioning

confidence: 99%

“…In seed quality control programs of forest (Simak, 1980) and olericultural (Chavagnat, 1987) species the Xray test is routinely utilized. Since morphological aspects of the seeds, possibly associated to viability, can be assessed through the X-ray test (Copeland & McDonald, 1985), many scientists have sought to establish a relationship between seed anatomy and germination or seedling morphology; such correspondence varies according to species (Simak, 1991).…”

Section: Introductionmentioning

confidence: 99%

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'Aroeira-branca' [Lithraea molleoides (Vell.) Engl. - Anacardiaceae] seed quality evaluation by the X-ray test

Machado¹,

Cícero²

2003

Sci. agric. (Piracicaba, Braz.)

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'Aroeira-branca', an arboreal species of great ecological and economic importance, is seed propagated and presents limitations with respect to the availability of methods for seed quality evaluation. The X-ray test has been considered of potential value because it is accurate, quick and nondestructive. In this context, the objective of this work was to verify the possibility of this test to detect damage and/or abnormalities in aroeira-branca embryos, in an attempt to correlate these anomalies to germination. Four seed lots were collected in different locations in the southern region of the State of Minas Gerais, Brazil, during 2001. The X-ray test consisted of submitting 100 seeds/lot to radiation (exposure of seeds to radiation of 13 kV/5 minutes) and classifying them according to embryo/embryo cavity proportions of 0, < 50, 50-75 and 100%, with the latter class divided into normal and abnormal according to embryo morphology. The germination test was then carried out to detect possible relationships between seed anatomy and the resulting seedling/ seed ratio, as revealed by radiographs. Seeds presenting an embryo/embryo cavity proportion lower than 100%, as determined by the X-ray test, did not germinate, and those presenting abnormal embryos produced abnormal seedlings or did not germinate, providing evidence that the X-ray test is effective to assess seed quality. Key words: radiography, embryo morphology, seed germination, forest species AVALIAÇÃO DA QUALIDADE DE SEMENTES DE AROEIRA-BRANCA [Lithraea molleoides (Vell.) Engl. -ANACARDIACEAE] POR MEIO DE RAIOS-XRESUMO: A aroeira-branca, espécie arbórea de grande importância ecológica e econômica, multiplica-se por sementes, as quais têm apresentado limitações quanto à disponibilidade de métodos para a avaliação da qualidade. O teste de raios-X tem se destacado por ser um método rápido, preciso e não destrutivo. Neste contexto, o presente trabalho foi realizado com o objetivo de verificar a possibilidade de uso do teste de raios-X na detecção de danos e ou anormalidades em embriões de aroeira-branca, bem como associá-los à germinação. Foram utilizados quatro lotes de sementes colhidas em áreas da região sul de Minas Gerais, no ano de 2001. Cem sementes/lote foram submetidas ao teste de raios-X, que consistiu na radiografia (condições de exposição à radiação: 13 kV/ 5 minutos) e classificação das sementes baseada na proporção do embrião em relação à cavidade embrionária, de 0, < 50, 50-75 e 100%, sendo a última classe dividida quanto à morfologia do embrião, em normal e anormal. Em seguida, foi conduzido o teste de germinação, visando detectar possíveis correspondências entre a anatomia das sementes e as respectivas plântulas/sementes resultantes. As sementes em que a proporção embrião/cavidade embrionária foi inferior a 100% não germinaram, e aquelas pertencentes à classe radiográfica de embriões morfologicamente anormais resultaram em plântulas anormais ou sementes não germinadas, evidenciando a eficiência da técnica de raios-X para avaliar a qualida...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

'Aroeira-branca' [Lithraea molleoides (Vell.) Engl. - Anacardiaceae] seed quality evaluation by the X-ray test

Machado¹,

Cícero²

2003

Sci. agric. (Piracicaba, Braz.)

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“…Radiography was carried out at I.N.R.A. Angers according to the method described by Chavagnat and Le Lezec (1984) and Chavagnat (1987). Measurements of pericarp and endocarp thicknesses and true seed section were made as described by Gudin et al (unpublished).…”

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confidence: 99%

Influence of Endocarp Thickness on Rose Achene Germination: Genetic and Environmental Factors

Gudin¹,

Aréne²,

Chavagnat³

et al. 1990

HortSci

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Rose achenes of different genetic origins, all belonging to the species Rosa hybrids L., subjected to radiography films, germination tests, in situ observations of embryo development, and different temperature conditions during maturation showed that achene germination is affected by endocarp thickness. Furthermore, a relation between embryo development rate and endocarp thickness is demonstrated.

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“…They were carried out at I.N.R.A. Angers according to the method described by Chavagnat and Le Lezec (1984) and Chavagnat (1987). The radiography films were used to study the achene structures.…”

Section: X-ray Radiographiesmentioning

confidence: 99%

Structure and water absorption of different parts of the rose achene pericarp during imbibition

Gudin¹,

Aréne²,

Chavagnat³

et al. 1991

Biol. plant.

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Rose achene imbibition is difficult. Comparison of sulphuric acid treated, Cross and Beavan's reagent (C. B. reagent) treated seeds with untreated seeds showed that, during imbibition, water is essentially found in the most external pericarp layer. Inner layers appear less permeable. It is possible to distinguish three layers in the pericarp by taking into account results from imbibition assays, X-ray radiographies and scanning electron microscopic observations. They can be interpreted as representing the epi-, meso-and endocarp.

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Détermination de la valeur culturale des semences par la radiographie industrielle aux rayons X. Application aux pépins de pommier (Malus pumila Mill.)

Cited by 10 publications

References 0 publications

'Aroeira-branca' [Lithraea molleoides (Vell.) Engl. - Anacardiaceae] seed quality evaluation by the X-ray test

'Aroeira-branca' [Lithraea molleoides (Vell.) Engl. - Anacardiaceae] seed quality evaluation by the X-ray test

Influence of Endocarp Thickness on Rose Achene Germination: Genetic and Environmental Factors

Structure and water absorption of different parts of the rose achene pericarp during imbibition

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