Abstract
The formation of viable angiosperm seeds involves the co-ordinated growth and development of three genetically distinct organisms, the maternally derived seed coat and the zygotic embryo and endosperm. The physical relationships of these tissues are initially established during the specification and differentiation of the female gametophyte within the tissues of the developing ovule. The molecular programmes implicated in both ovule and seed development involve elements of globally important pathways (such as auxin signalling), as well as ovule- and seed-specific pathways. Recurrent themes, such as the precisely controlled death of specific cell types and the regulation of cell–cell communication and nutrition by the selective establishment of symplastic and apoplastic barriers, appear to play key roles in both pre- and post-fertilization seed development. Much of post-fertilization seed growth occurs during a key developmental window shortly after fertilization and involves the dramatic expansion of the young endosperm, constrained by surrounding maternal tissues. The complex tissue-specific regulation of carbohydrate metabolism in specific seed compartments has been shown to provide a driving force for this early seed expansion. The embryo, which is arguably the most important component of the seed, appears to be only minimally involved in early seed development. Given the evolutionary and agronomic importance of angiosperm seeds, the complex combination of communication pathways which co-ordinate their growth and development remains remarkably poorly understood.
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Abbreviations
- AP2:
-
APETALA2
- ALE1:
-
ABNORMAL LEAF SHAPE1
- ALE2:
-
ABNORMAL LEAF SHAPE2
- ACR4:
-
ARABIDOPSIS CRINKLY4
- AGP:
-
Arabinogalactan protein
- AGO9:
-
ARGONAUTE 9
- ATO:
-
ATROPOS
- ARF2:
-
AUXIN RESPONSE FACTOR2
- CLO:
-
CLOTHO
- C/M:
-
Chalazal/micropylar
- CDKA;1:
-
CYCLIN-DEPENDENT KINASE A;1
- DEK:
-
DEFECTIVE KERNEL
- EMB:
-
EMBRYO SPECIFIC
- ESR:
-
Embryo surrounding region
- FBL17:
-
F-BOX-LIKE PROTEIN 17
- FM:
-
Functional megaspore
- IKU1:
-
HAIKU1
- IKU2:
-
HAIKU2
- IAA:
-
Indole-3-acetic acid
- IPT:
-
ISOPRENYL TRANSFERASE
- KPR2:
-
KIP RELATED PROTEIN2
- LIS:
-
LACHENSIS
- LRR-RLK:
-
Leucine-rich repeat receptor-like kinase
- MMC:
-
Megaspore mother cell
- MINI3:
-
MINISEED3
- MSP1:
-
MULTIPLE SPOROCYTE1
- RNA:
-
Ribonucleic acid
- SHB1:
-
SHORT HYPOCOTYL UNDER BLUE1
- siRNAs:
-
Small interfering RNAs
- SPL:
-
SPOROCYTELESS
- SAP:
-
STERILE APETALA
- TTG2:
-
TRANSPARENT TESTA GLABRA2
- ZOU:
-
ZHOUPI
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Acknowledgements
I would like to thank Professor Alison Smith (John Innes Centre, Norwich), Dr Peter Rogowsky (RDP, ENS-Lyon) and Dr Justin Goodrich, Jessica Fitzgibbon and Andrew Waters (University of Edinburgh) for discussions and helpful comments on the manuscript. GI was supported by an RCUK Fellowship.
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Ingram, G.C. Family life at close quarters: communication and constraint in angiosperm seed development. Protoplasma 247, 195–214 (2010). https://doi.org/10.1007/s00709-010-0184-y
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DOI: https://doi.org/10.1007/s00709-010-0184-y