Developmental morphology and anatomy of the reproductive structures in sunflower (<i>Helianthus annuus</i>): a unified temporal scale

Lindström, Lilia Ivone; Hernández, Luís

doi:10.1139/cjb-2014-0245

Cited by 13 publications

(13 citation statements)

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“…In our study, EXPN expression patterns suggest an earlier specific role (from − 12 to + 6 DFA) for EXPN7 and EXPN10 in the ovary and pericarp, respectively, compared with other isoforms. This agrees with Lindström and Hernández (2015) [ 51 ], who demonstrated that final pericarp size is attained at + 8 DFA when secondary wall deposition in the pericarp cells begins.…”

Section: Discussionsupporting

confidence: 92%

“…Maximum pericarp water content was attained by + 10 DFA (Fig. 3 ), concurring with other studies [ 8 , 51 ] and reinforcing the link between EXPN expression and water dynamics of sunflower grains. In our study, EXPN expression patterns suggest an earlier specific role (from − 12 to + 6 DFA) for EXPN7 and EXPN10 in the ovary and pericarp, respectively, compared with other isoforms.…”

Section: Discussionsupporting

confidence: 91%

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Expansin genes expression in growing ovaries and grains of sunflower are tissue-specific and associate with final grain weight

et al. 2018

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BackgroundGrain weight (GW) is a key component of sunflower yield and quality, but may be limited by maternal tissues. Cell growth is influenced by expansin proteins that loosen the plant cell wall. This study aimed to identify spatio-temporal expression of EXPN genes in sunflower reproductive organ tissues (ovary, pericarp, and embryo) and evaluate correlations between reproductive organ growth and expansin genes expression. Evaluations involved eight different developmental stages, two genotypes, two source-sink treatments and two experiments. The genotypes evaluated are contrasting in GW (Alybro and confection variety RHA280) under two source-sink treatments (control and shaded) to study the interactions between grain growth and expansin genes expression.ResultsOvaries and grains were sampled at pre- and post-anthesis, respectively. Final GW differed between genotypes and shading treatments. Shading treatment decreased final GW by 16.4 and 19.5% in RHA280 and Alybro, respectively. Relative expression of eight expansin genes were evaluated in grain tissues. EXPN4 was the most abundant expansin in the ovary tissue, while EXPN10 and EXPN7 act predominantly in ovary and pericarp tissues, and EXPN1 and EXPN15 in the embryo tissues.ConclusionsSpecific expansin genes were expressed in ovary, pericarp and embryo in a tissue-specific manner. Differential expression among grain tissues was consistent between genotypes, source-sink treatments and experiments. The correlation analysis suggests that EXPN genes could be specifically involved in grain tissue extension, and their expression could be linked to grain size in sunflower.Electronic supplementary materialThe online version of this article (10.1186/s12870-018-1535-7) contains supplementary material, which is available to authorized users.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 91%

Expansin genes expression in growing ovaries and grains of sunflower are tissue-specific and associate with final grain weight

et al. 2018

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“…24 At that time achene filling in the peripheral flowers had begun. 25 At R8 all flowers had reached full development within the inflorescence.…”

Section: Flower Removal Experimentsmentioning

confidence: 99%

Spatial Constraints Also Regulates Final Achene Mass in the Sunflower (Helianthus annuus L.) Capitulum

Hernández

2015

IJPB

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In capitula of the cultivated sunflower (<em>Helianthus annuus</em> L.) achene size and mass commonly decrease from proximal to distal positions. Temporal limitation of resources of the distal achenes over the proximal ones has been the common explanation for this response. Nevertheless, because the capitulum architecture and expansion dynamics also interacts with achene growth and development, also space exert a coupled effect with resources on achene size along the inflorescence radius. In this work we removed young achenes from different capitulum positions [inner sector (IS) and outer sector (OS)] and applied an artificial restriction to the capitulum/achenes radial expansion. Removal of outer achenes significantly increased the final dry mass of the remnant ones between 17.1 to 27.6%. Removal of inner achenes also produced the same effect but in less magnitude, between 9.3 to 17.9% of the outer ones. The removal of outer achenes with the application of an artificial peripheral constraint did not significantly increase the dry mass of the remnant ones (2.7% of the inner and 7.1% of the control). Percentage of empty achenes significantly diminished in the middle sector (MS) in capitula with the outer achenes removed and in capitula with the outer achenes removed plus a peripheral constraint but in the range of 7.1% (MS achenes) and 2.7 % (IS achenes). Percentage of empty achenes of the MS did not change when the outer achenes were removed but was significantly lower when the OS was removed and the peripheral constraint was applied. This results suggest that a part of the reduced growth and development of IS and MS achenes is not only controlled by the competition for resources but also is restricted by space and pressure exerted by the neighboring ones.

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“…For each year and growing period, bars not sharing a common letter are significantly different at the .05 probability level filled grain number due to flower or developing embryo abortion (Egli, 1998;Lindström et al, 2006). Once filled grain number is fixed (Lindström & Hernández, 2015), adjustment in grain yield as consequence stress conditions could occur only through variation in grain weight. In our work, the higher moisture and thermal stress indices during the emergence to maturity period in 2013 than in 2012 (Table 1) reduced grain yield, filled grain number, and to a lesser extent weight per grain (Figure 2a).…”

Section: Filled Grain Numbermentioning

confidence: 99%

How sowing date affects development and performance of safflower through climate variables

et al. 2021

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Safflower (Carthamus tinctorius L.) has unrealized potential as an alternative crop in many semiarid regions including central Argentina. Our objective was to relate how temperature and precipitation conditions with fall (5 June 2012 and 23 Apr. 2013) and winter sowing (13 Aug. 2012 and 20 Aug. 2013) affected phenology, yield, yield components, and oil percent in four winter and eight spring-type safflower accessions in the semiarid region of central Argentina. Fall sowing was associated with lower temperatures, higher precipitation, lower heat/moisture stress indices and precipitation deficits than winter sowing. Rosette period lasted 55 d longer, and stem elongation to anthesis period 30 d longer in fall than in winter sowing. However, anthesis was advanced only few days in fall sowing and duration of postanthesis development was comparable between sowing regimes and years. Fall sowing plants averaged 3,252 filled grains m -2 and a grain yield of 109.8 g m -2 , whereas winter sowing plants averaged 1,443 filled grains m -2 and a grain yield of 49.3 g m -2 . Grain yield was 35% higher in winter than in spring-type accessions, but winter types had lower oil percent (22.0%) than spring-types (33.3%). In the semiarid region of central Argentina, we recommend fall sowing as it extended the growing season in terms of days preanthesis and presented favorable climatic conditions for safflower development.

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Developmental morphology and anatomy of the reproductive structures in sunflower (Helianthus annuus): a unified temporal scale

Cited by 13 publications

References 35 publications

Expansin genes expression in growing ovaries and grains of sunflower are tissue-specific and associate with final grain weight

Expansin genes expression in growing ovaries and grains of sunflower are tissue-specific and associate with final grain weight

Spatial Constraints Also Regulates Final Achene Mass in the Sunflower (Helianthus annuus L.) Capitulum

How sowing date affects development and performance of safflower through climate variables

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