Grain 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. | Nội dung Text Expansin genes expression in growing ovaries and grains of sunflower are tissue-specific and associate with final grain weight .den color inherit .ttnd ol .ttnd ul .ttnd dl padding 0 0px 0 20px .ttnd hr margin 10px 0px .ttnd a href javascript void 0 .ttnd a href color inherit dtextscript p text-align left dtextscript img vertical-align middle Castillo et al. BMC Plant Biology 2018 18 327 lt br gt https s12870-018-1535-7 lt br gt lt br gt lt br gt lt br gt lt br gt RESEARCH ARTICLE Open Access lt br gt lt br gt Expansin genes expression in growing lt br gt ovaries and grains of sunflower are lt br gt tissue-specific and associate with final lt br gt grain weight lt br gt Francisca M. Castillo1 2 Javier Canales3 4 Alejandro Claude3 and Daniel F. Calderini2 lt br gt lt br gt lt br gt Abstract lt br gt Background Grain weight GW is a key component of sunflower yield and quality but may be limited by lt br gt maternal tissues. Cell growth is influenced by expansin proteins that loosen the plant cell wall. This study aimed to lt br gt identify spatio-temporal expression of EXPN genes in sunflower reproductive organ tissues ovary pericarp and lt br gt embryo and evaluate correlations between reproductive organ growth and expansin genes expression. Evaluations lt br gt involved eight different developmental stages two genotypes two source-sink treatments and two experiments. lt br gt The genotypes evaluated are contrasting in GW Alybro and confection variety RHA280 under two source-sink lt br gt treatments control and shaded to study the interactions between grain growth and expansin genes expression. lt br gt Results Ovaries and grains were sampled at pre- and post-anthesis respectively. Final GW differed between lt br gt genotypes and shading treatments. Shading treatment decreased final GW by and in RHA280 and lt br gt Alybro respectively. Relative expression of eight expansin genes were evaluated in grain tissues. EXPN4 was the
