Seed coat morphology and evolution in Celtidaceae and Ulmaceae (Urticales)

1990 ◽  
Vol 103 (1) ◽  
pp. 25-41 ◽  
Author(s):  
Tokushiro Takaso ◽  
Hiroshi Tobe
Keyword(s):  
Seed Coat ◽  
Seed Coat Morphology

The role of fractures and lipids in the seed coat in the loss of hardseededness of six Mediterranean legume species

2005 ◽  
Vol 143 (1) ◽  
pp. 43-55 ◽  
Author(s):  
L. W. ZENG ◽  
P. S. COCKS ◽  
S. G. KAILIS ◽  
J. KUO
Keyword(s):  
Seed Coat ◽  
Lipid Content ◽  
Environmental Scanning Electron Microscopy ◽  
Environmental Scanning ◽  
Petroleum Jelly ◽  
Physicochemical Changes ◽  
Ornithopus Sativus ◽  
Seed Coats ◽  
Seed Coat Morphology

Changes in the seed coat morphology of 12 annual legumes were studied using environmental scanning electron microscopy (ESEM). The seeds of Biserrula pelecinus L. cv. Casbah, Ornithopus sativus cv. Cadiz, Trifolium clypeatum L., T. spumosum L., T. subterraneum L. cv. Bacchus Marsh, Trigonella balansae Boiss. & Reuter., Trigonella monspeliaca L. and Vicia sativa subsp. amphicarpa Dorthes (morthes.) were examined by ESEM after exposure to field conditions for 6 months, while those of Medicago polymorpha L. cv. Circle Valley, Trifolium clypeatum L., T. glanduliferum Boiss., T. lappaceum L., T. spumosum L., and T. subterraneum L. cv. Dalkeith, were examined after 2 years' exposure. The entry of water into seeds was followed by covering various parts of the seed coat with petroleum jelly and soaking the treated seeds in dyes.As the seeds softened over time, more and larger fractures appeared on the seed coat. Water entered the seed either through fractures, over the seed coat as a whole or through the lens. It is hypothesized that the formation of fractures occurs after physicochemical changes in the seed coat, probably associated with changes in the amount and nature of seed coat lipids.The newly matured whole seeds of M. polymorpha cv. Circle Valley, T. clypeatum, T. glanduliferum, T. lappaceum, T. spumosum, and T. subterraneum cv. Dalkeith were analysed for lipid content in 1997. The seed coats of T. subterraneum cv. Dalkeith and T. spumosum were separated from the cotyledons and examined in detail for lipid content.The lipid content of whole seeds ranged from 48 (T. lappaceum) to 167 mg/g (T. subterraneum cv. Dalkeith). Total lipid of the whole seeds of T. subterraneum cv. Dalkeith and T. glanduliferum declined by about 9 mg/g over 2 years, while in T. spumosum it declined by about 17 mg/g.In contrast, the major fatty acids in the seed coat declined by 0·67 mg/g over the 2 years. Change in seed coat lipids showed a marked similarity to changes in hardseededness for both T. subterraneum cv. Dalkeith and T. spumosum. The results strongly suggest that seed softening is associated with loss of lipids in the seed coat, because lipids have physical characteristics that are altered at temperatures experienced in the field.

scholarly journals Seed coat morphology and its systematic implications in Cyanea and other genera of Lobelioideae (Campanulaceae)

2001 ◽  
Vol 88 (7) ◽  
pp. 1301-1308 ◽  
Author(s):  
Craig C. Buss ◽  
Thomas G. Lammers ◽  
Robert R. Wise
Keyword(s):  
Seed Coat ◽  
Seed Coat Morphology

Evaluation of morphological and anatomical characters for discrimination and verification of some Medicago sativa (L.) Cultivars

2016 ◽  
Vol 50 (2) ◽  
Author(s):  
Mohamed M. Moawed
Keyword(s):  
Medicago Sativa ◽  
Seed Coat ◽  
Anatomical Variation ◽  
Morphological Characters ◽  
Vascular Bundles ◽  
Surface Patterns ◽  
Anatomical Characters ◽  
Periclinal Walls ◽  
Seed Coat Morphology ◽  
Morphological And Anatomical Variation

<italic>Medicago sativa</italic> L. (alfalfa) is one of the most important legume forages in the world. The objective of this study was to characterize and discriminate among 15 alfalfa cultivars with a different geographical origin. Macro-morphological and anatomical characters as well as seed coat sculpture were investigated. Twenty five morphological characters were extracted directly from the fresh specimens. Transverse section in the main stem were carried out; stained and seventeen anatomical characters were examined by light microscope. Seed coat surface was investigated using Scanning Electron Microscope (SEM). Data obtained were coded and analysed using NTsys-Pc software (Version 2.02) and the resulted dendrogram is discussed. The results showed morphological and anatomical variation between the studied taxa. Vascular bundles ranged from 16 to 23. The Egyptian cultivar Nubaria has the lowest number of vessels (16) while the American Super supreme has the larger number (23). The seed coat ornamentation revealed five main surface patterns and suggests the presence of variations in anticlinal boundaries and periclinal walls that provide stable diagnostic characters for morphologically closely related taxa. The dendrogram showed that the Egyptian cultivar Nubaria was the most distant and clustered separately from all the other alfalfa cultivars which were grouped into two main clusters. Seed coat morphology and combination of other plant morphological and anatomical characters permitted identification and discrimination between the examined cultivars. Results obtained in this work could be considered for further breeding strategies and studies.

Seed Coat Morphology in Gentianopsis (Gentianaceae)

Rhodora ◽  
2010 ◽  
Vol 112 (949) ◽  
pp. 58-79 ◽  
Author(s):  
Barbara A. Whitlock ◽  
Julie Silver ◽  
Jeffrey S. Prince
Keyword(s):  
Seed Coat ◽  
Seed Coat Morphology

Seed coat morphology inSapium sebiferumin relation to its mechanism of water uptake

2015 ◽  
Vol 90 (6) ◽  
pp. 613-618 ◽  
Author(s):  
J. Zhou ◽  
Y. T. Yin ◽  
C. M. Qian ◽  
Z. Y. Liao ◽  
Y. Shu ◽  
...  
Keyword(s):  
Water Uptake ◽  
Seed Coat ◽  
Seed Coat Morphology

Classification and differentiation of the genus Peganum indigenous to China based on chloroplast trnL-F and psbA-trnH sequences and seed coat morphology

Plant Biology ◽  
2011 ◽  
Vol 13 (6) ◽  
pp. 940-947 ◽  
Author(s):  
T. Zhao ◽  
Z.-T. Wang ◽  
C. J. Branford-White ◽  
H. Xu ◽  
C.-H. Wang
Keyword(s):  
Seed Coat ◽  
Seed Coat Morphology

Contrasting seed morphology dynamics in relation to the alleviation of dormancy with soil storage

2000 ◽  
Vol 78 (9) ◽  
pp. 1187-1198 ◽  
Author(s):  
Anle Tieu ◽  
Louise M Egerton-Warburton
Keyword(s):  
Seed Coat ◽  
Seed Morphology ◽  
Environmental Cues ◽  
Significant Deterioration ◽  
Soil Burial ◽  
Soil Storage ◽  
Physiological Dormancy ◽  
Fruit Wall ◽  
Species Specific ◽  
Seed Coat Morphology

We examined the effect of prolonged (up to 450 days) soil burial in the field on seed morphological traits (seed coat structure, permeability) to identify their potential roles in seed dormancy and release. Such traits were examined in species with seeds that demonstrated an obligate requirement for soil storage before germination: the dormant seeds of Anigozanthos manglesii D. Don, Conostylis neocymosa Hopper, Stylidium affine Sonder, and Stylidium crossocephalum F. Muell., and the deeply dormant fruits of Leucopogon conostephioides D.C. We detected species-specific and environmentally induced variation in seed morphology following soil burial. In A. manglesii and L. conostephioides, a significant deterioration of the seed coat or fruit wall and an increased permeability of the seed coat to water and solutes were correlated with germination responses. In these species, the seed coat and (or) fruit wall delayed germination until (morpho) physiological dormancy was broken. In C. neocymosa, S. affine, and S. crossocephalum, weathering of the seed coat, permeability, and germination were not correlated traits. These species appeared to possess physiological dormancy mechanisms and required environmental cues for dormancy release.Key words: physiological dormancy, soil burial, seed coat, morphology.

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