Changes in Soybean Fruit Ca2+ (Sr2+) and K+ (Rb+) Transport Ability during Development

Laszlo, Joseph A.

doi:10.1104/pp.104.3.937

Cited by 19 publications

(11 citation statements)

References 26 publications

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“…In both species, fruits of the same size contained seeds of different sizes during late fruit development as a result of accelerated seed growth during late embryo development. A similar finding has been described for Glycine max (Laszlo, 1994). This growth occurred when the storage reserves were transferred to the embryo and characterized fruit ripeness.…”

Section: Discussionsupporting

confidence: 89%

Fruit and seed ontogeny related to the seed behaviour of two tropical species of Caesalpinia (Leguminosae)

Teixeira

Carmello-Guerreiro

Machado

2004

Botanical Journal of the Linnean Society

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Caesalpinia echinata and C. ferrea var. ferrea have different seed behaviours and seed and fruit types. Comparison of the seed ontogeny and anatomy partly explained the differences in seed behaviour between these two species of Brazilian legumes; some differences were also related to fruit development. The seed coat in C. ferrea consisted of two layers of osteosclereids, as well as macrosclereids and fibres, to form a typical legume seed coat, whereas C. echinata had only macrosclereids and fibres. In C. echinata, the developing seed coat had paracytic stomata, a feature rarely found in legume seeds. These seed coat features may account for the low longevity of C. echinata seeds. The embryogeny was similar in both species, with no differences in the relationship between embryo growth and seed growth. The seeds of both species behaved as typical endospermic seeds, despite their different morphological classification (exendospermic orthodox seeds were described for C. echinata and endospermic orthodox seeds for C. ferrea). Embryo growth in C. ferrea accelerated when the sclerenchyma of the pericarp was developing, whereas embryonic growth in C. echinata was associated with the conclusion of spine and secretory reservoir development in the pericarp. Other features observed included an endothelial layer that secreted mucilage in both species, a nucellar summit, which grew up into the micropyle, and a placental obturator that connected the ovarian tissue to the ovule in C. ferrea.

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Section: Discussionsupporting

confidence: 89%

Fruit and seed ontogeny related to the seed behaviour of two tropical species of Caesalpinia (Leguminosae)

Teixeira

Carmello-Guerreiro

Machado

2004

Botanical Journal of the Linnean Society

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“…Most of the Ca accumulated in the seed coat, and very little was translocated to the cotyledons. The seed coat is believed to be a control site for Ca transport into the seed of legumes (Mix and Marschner 1976a ;Laszlo 1994). If this is so, decreases in seed-coat area/cotyledon weight ratios with increasing seed size may explain the lower Ca concentrations in kidney and cranberry beans.…”

Section: Discussionmentioning

confidence: 99%

Accumulation of Calcium in Bean Cultivars Differing in Seed Size

Moraghan

Grafton

1997

J. Sci. Food Agric.

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Accumulation of Ca, Mg and K, the principal cations in dry bean (Phaseolus vulgaris L) seed, was studied under field and greenhouse conditions. ‘Cran‐09’, a cranberry bean and ‘Norstar’, a navy bean, were grown to maturity under greenhouse conditions. ‘Cran‐09’ had a seed weight of 605 mg, a seed Ca concentration of 1·2 g kg‐1 and a Ca harvest index of 0·032. The corresponding three parameters in ‘Norstar’ were a seed weight of 161 mg, a seed Ca concentration of 2·2 g kg‐1 and a Ca harvest index of 0·064. The difference in seed Ca concentration was not due to increased absorption of Ca by ‘Norstar’, but rather was due to a larger proportion of Ca in plant tops being diverted to the seed component. The larger seed Ca concentration in ‘Norstar’ was compensated to some extent by a smaller seed K concentration. In contrast to Ca, cultivar had relatively little effect on harvest indices for Mg, K, N and P. The average seed Ca concentration in six navy bean cultivars grown under field conditions was 90% more than that of three kidney and three cranberry bean cultivars. © 1997 SCI.

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“…These studies mainly have focused on legume cotyledons, which accumulate large amounts of K + (Laszlo 1994) from an enriched seed apoplasm containing K + concentrations of up to 100 mM (Patrick 1994). Thus, a low affinity K + channel would be expected to mediate K + influx across plasma membranes of cotyledon dermal cells.…”

Section: Mineral Ionsmentioning

confidence: 99%

Review: Nutrient loading of developing seeds

Zhang

Zhou

Dibley

et al. 2007

Functional Plant Biol.

181

183

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Abstract. Interest in nutrient loading of seeds is fuelled by its central importance to plant reproductive success and human nutrition. Rates of nutrient loading, imported through the phloem, are regulated by transport and transfer processes located in sources (leaves, stems, reproductive structures), phloem pathway and seed sinks. During the early phases of seed development, most control is likely to be imposed by a low conductive pathway of differentiating phloem cells serving developing seeds. Following the onset of storage product accumulation by seeds, and, depending on nutrient species, dominance of path control gives way to regulation by processes located in sources (nitrogen, sulfur, minor minerals), phloem path (transition elements) or seed sinks (sugars and major mineral elements, such as potassium). Nutrients and accompanying water are imported into maternal seed tissues and unloaded from the conducting sieve elements into an extensive post-phloem symplasmic domain. Nutrients are released from this symplasmic domain into the seed apoplasm by poorly understood membrane transport mechanisms. As seed development progresses, increasing volumes of imported phloem water are recycled back to the parent plant by process(es) yet to be discovered. However, aquaporins concentrated in vascular and surrounding parenchyma cells of legume seed coats could provide a gated pathway of water movement in these tissues. Filial cells, abutting the maternal tissues, take up nutrients from the seed apoplasm by membrane proteins that include sucrose and amino acid/H + symporters functioning in parallel with non-selective cation channels. Filial demand for nutrients, that comprise the major osmotic species, is integrated with their release and phloem import by a turgorhomeostat mechanism located in maternal seed tissues. It is speculated that turgors of maternal unloading cells are sensed by the cytoskeleton and transduced by calcium signalling cascades.

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Changes in Soybean Fruit Ca2+ (Sr2+) and K+ (Rb+) Transport Ability during Development

Cited by 19 publications

References 26 publications

Fruit and seed ontogeny related to the seed behaviour of two tropical species of Caesalpinia (Leguminosae)

Fruit and seed ontogeny related to the seed behaviour of two tropical species of Caesalpinia (Leguminosae)

Accumulation of Calcium in Bean Cultivars Differing in Seed Size

Review: Nutrient loading of developing seeds

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