Some Orient genotypes of Brassica rapa have so called A-type seed coat. Large cells of outer layer with walls made of polymer are swelling in water. The seed coat is formed by mother plant but A-type is controlled by genes in embryo.
It has been studied recently in arabidopsis plant - seed coat mucilage secretory cell devel
opment.
1. Windsor JB, Symonds VV, Mendenhall J, Lloyd AM.
2000.Arabidopsis seed coat development: morphological differenti
ation of the outer integument. Plant Journal22: 483493.
2. Western TL. 2012.The sticky tale of seed coat mucilages: produc
tion, genetics, and role in seed germination and dispersal.Seed
Science Research22: 1 25.
3. Yang X, Baskin J, Baskin C, Huang Z. 2012b. More than just a coat
ing: ecological importance, taxonomic occurrence and phylogenetic
relationships of seed coat mucilage.Perspectives in Plant Ecology,
Evolution and Systematics14: 434 442.
4. Western TL, Skinner DJ, Haughn GW. 2000. Differentiation of
mucilage secretory cells of the Arabidopsis seed coat.Plant
Physiology122: 345 356.
5. Western TL, Burn J, Tan WL,et al. 2001. Isolation and characteriza
tion of mutants defective in seed coat mucilage secretory cell devel
opment in Arabidopsis.Plant Physiology127: 9981011.
6. North HM, Berger A, SaezAguayo S, Ralet MC. Understanding
polysaccharide production and properties using seed coat mutants:
future perspectives for the exploitation of natural variants. Ann Bot.
2014 Oct;114(6):125163. doi: 10.1093/aob/mcu011.
7. Western TL, Young DS, Dean GH, Tan WL, Samuels AL, Haughn
GW. 2004. MUCILAGEMODIFIED4 encodes a putative pectin
biosynthetic enzyme developmentally regulated by APETALA2,
TRANSPARENT TESTA GLABRA1, and GLABRA2 in the Arabidopsis
seed coat. Plant Physiology 134: 296306.
8. Zou HF, Zhang YQ, Wei W, Chen HW, Song QX, Liu YF, Zhao MY,
Wang F, Zhang BC, Lin Q, Zhang WK, Ma B, Zhou YH, Zhang JS,
Chen SY. The transcription factor AtDOF4.2 regulates shoot branch
ing and seed coat formation in Arabidopsis. Biochem J. 2013 Jan
15;449(2):37388. doi: 10.1042/BJ20110060.
9. Esfandiari E, Jin Z, Abdeen A, Griffiths JS, Western TL, Haughn GW.
Identification and analysis of an outerseedcoatspecific promoter
from Arabidopsis thaliana. Plant Mol Biol. 2013 Jan;81(12):93104.
doi:10.1007/s1110301299840.
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