Partitioning of 13C-Photosynthate in Sweet Pea (Lathyrus odoratus L.) Plants during the Flowering Period.

Flower-bud blasting is a constraint for producing Eustoma grandiflorum so a preventative strategy is needed. Flower-bud blasting occurs under low light intensity and high fertilizer input. To gain insight into the mechanisms of flower-bud blasting, we conducted a detailed characterization of flower development under normal and blastinducing conditions. We found that floral buds under low light intensity ceased to grow at the stamen and gynoecium differentiation stages, although sepals and petals were initiated normally. Aborted flowers rarely had normal ovules. Moreover, an expanded apical meristem was observed. These results show that the differentiation and development of reproductive organs are critically suppressed by blast-inducing conditions; however, combined application of 300 ppm benzylaminopurine and 200 ppm gibberellic acid-3 to floral buds resulted in about five-fold greater frequency of flower opening compared to controls. Blasting inhibition also resulted from excising the inflorescent branch, suggesting the decrease in assimilates in flower buds would be attributed to flower-bud blasting. Moreover, hormone application combined with excision had an additive effect for preventing flower-bud blasting, suggesting that these treatments independently inhibit flower-bud blasting. These results suggest that flower-bud blasting in Eustoma is a break in floral development around the stamen and gynoecium initiation stages and is integrally induced by the factors related to hormone biosynthesis and the decrease in assimilates.

Section: Discussionmentioning

confidence: 99%

Anatomical Characterization of Flower-bud Blasting and Suppression Following Hormone Application in Eustoma grandiflorum (Raf.) Shinn.

Kawakatsu

Ushio

Fukuta

2012

“…In this study, the number of buds in the inflorescences increased by restricting the number of inflorescences per plant. Our previous study indicated that the amount of 13 C distribution to the apical portion and the inflorescence increased by removing buds from other inflorescences (Fudano et al, 2001). The increase in the number of buds per inflorescence may result from the increased amount of photosynthate distributed to the apical portion.…”

Section: Treatmentmentioning

confidence: 95%

Factors Influencing the Number of Buds per Inflorescence in Sweet Pea (Lathyrus odoratus L.)

Fudano

Hayashi

Yazawa

2009

Self Cite

The number of buds per inflorescence fluctuates irregularly in the sweet pea (Lathyrus odoratus L.) winterflowering variety 'Early Pink'. The number of buds per inflorescence and the fluctuation of the number of buds per inflorescence differ remarkably among plants. The number of buds per inflorescence, diameter of flower stalks, dry matter of cut flowers, and diameter of internodes increased, and short cyclic fluctuations in the number of buds per inflorescence were suppressed as the frequency of removing immature inflorescences increased. Using a moving average, the fluctuation of the number of buds per inflorescence was found to be a combination of two periodic fluctuations in 26 of 36 plants. [2][3][4][5][6][8][9][10][11][12], and more than 15 node periodic fluctuations were found in 10, 15, 11, and 16 plants, respectively. From these results, the factors that cause the number of buds per inflorescence to fluctuate are discussed.

“…We previously reported 13 C partitioning in inflorescences of sweet pea (Fudano et al, 2001). Supposing that new inflorescences appear at intervals of four days and the second bud blooms 14 days after budding, 13 C partitioning to the inflorescence at 2, 6, 10, and 14 days after budding is 0.257, 0.761, 0.951, and 0.801 mg, respectively.…”

Section: Dynamic Model For Dry Matter Partitioning In the Inflorescencementioning

confidence: 96%

Dynamic Model of Dry Matter Distribution and Stabilization in the Number of Buds per Inflorescence by Overnight Supplemental Lighting in Sweet Pea (Lathyrus odoratus L.)

Fudano

Hayashi

Yazawa

2009

Self Cite

A system dynamic model of dry matter distribution between each inflorescence was constructed for sweet pea plants during flowering. The amount of dry matter distributed to each inflorescence is proportional to the product of dry matter and the relative growth rate of the inflorescence in the model. When the total dry matter supplied to the inflorescence per day is changed, the change of dry matter of the inflorescence is continuous without converging. Conversely, when the total dry matter supplied to the inflorescence per day is kept constant, the change in dry matter of the inflorescence converges immediately. From these simulation results, the hypothesis was formulated that the change in dry matter of an inflorescence is suppressed by reducing the change in total dry matter supplied to the inflorescence.