scholarly journals Probing the floral developmental stages, bisexuality and sex reversions in castor (Ricinus communis L.)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sujatha Thankeswaran Parvathy ◽  
Amala Joseph Prabakaran ◽  
Thadakamalla Jayakrishna
Keyword(s):  
Developmental Stages ◽  
Ricinus Communis ◽  
Sex Expression ◽  
Pistil Abortion ◽  
Ricinus Communis L ◽  
Sex Reversion ◽  
Stage 4 ◽  
Meristem Development ◽  
Male Specific ◽  
First Time

AbstractCastor (Ricinus communis L) is an ideal model species for sex mechanism studies in monoecious angiosperms, due to wide variations in sex expression. Sex reversion to monoecy in pistillate lines, along with labile sex expression, negatively influences hybrid seed purity. The study focuses on understanding the mechanisms of unisexual flower development, sex reversions and sex variations in castor, using various genotypes with distinct sex expression pattern. Male and female flowers had 8 and 12 developmental stages respectively, were morphologically similar till stage 4, with an intermediate bisexual state and were intermediate between type 1 and type 2 flowers. Pistil abortion was earlier than stamen inhibition. Sex alterations occurred at floral and inflorescence level. While sex-reversion was unidirectional towards maleness via bisexual stage, at high day temperatures (Tmax > 38 °C), femaleness was restored with subsequent drop in temperatures. Temperature existing for 2–3 weeks during floral meristem development, influences sexuality of the flower. We report for first time that unisexuality is preceded by bisexuality in castor flowers which alters with genotype and temperature, and sex reversions as well as high sexual polymorphisms in castor are due to alterations in floral developmental pathways. Differentially expressed (male-abundant or male-specific) genes Short chain dehydrogenase reductase 2a (SDR) and WUSCHEL are possibly involved in sex determination of castor.

scholarly journals Author Correction: Probing the floral developmental stages, bisexuality and sex reversions in castor (Ricinus communis L.)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sujatha Thankeswaran Parvathy ◽  
Amala Joseph Prabakaran ◽  
Thadakamalla Jayakrishna
Keyword(s):  
Developmental Stages ◽  
Ricinus Communis ◽  
Ricinus Communis L

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

scholarly journals Effect of daminozide (B9) on sex-expression and seed setting in castor bean, Ricinus communis L.

1987 ◽  
Vol 37 (3) ◽  
pp. 262-266 ◽  
Author(s):  
S.V. S CHAUHAN ◽  
B.K. SAXENA ◽  
Toshiro KINOSHITA
Keyword(s):  
Castor Bean ◽  
Ricinus Communis ◽  
Sex Expression ◽  
Seed Setting ◽  
Ricinus Communis L

Seed development in Ricinus communis cv. Hale (castor bean). II. Accumulation of phytic acid in the developing endosperm and embryo in relation to the deposition of lipid, protein, and phosphorus

1984 ◽  
Vol 62 (2) ◽  
pp. 255-261 ◽  
Author(s):  
J. S. Greenwood ◽  
D. J. Gifford ◽  
J. D. Bewley
Keyword(s):  
Phytic Acid ◽  
Total Phosphorus ◽  
Castor Bean ◽  
Ricinus Communis ◽  
Endosperm Development ◽  
Total Acid ◽  
Ricinus Communis L ◽  
Phosphorus Containing ◽  
Total Pool ◽  
First Time

The accumulation of phytic acid in the developing endosperm and embryo of the castor bean seed (Ricinus communis L. cv. Hale) has been followed in relation to the deposition of the major lipid and protein reserves. In the endosperm, there is a considerable degree of synchronization in the synthesis and deposition of these reserves, although phytic acid accumulation lags behind that of total protein and lipid. The pattern of reserve deposition within the embryo is documented for the first time. Lipid accumulation commences later than in the endosperm, and the major deposition of phytic acid is also later; protein deposition continues longer in the embryo than in the endosperm. Changes in various phosphorus-containing fractions were followed in both the embryo and endosperm during development, viz total, acid-soluble, inorganic, and lipid phosphorus. While sugar and nucleoside phosphates, and then nucleic acid and protein phosphorus, are predominant in the total phosphorus pool earlier in endosperm development, later there is a large increase in the total pool size, which is attributable particularly to phytic acid formation. This component accounts for over 90% of the total phosphorus content of the mature dry endosperm. A similar pattern of events occurs in the developing embryo.

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