บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Effect of blue-light PPFD percentage during red and blue led low light irradiation storage on photosynthetic protein contents of grafted tomato plug seedlings.

Ohashi K.K., Fujiwara K., Kimura Y., Kurata K.

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004, p.51

2004

บทคัดย่อ

Effect of blue-light PPFD percentage during red and blue led low light irradiation storage on photosynthetic protein contents of grafted tomato plug seedlings. We have recently reported that mixed light irradiation of red and blue rather than red light alone would suppress the decrease in photosynthetic protein contents of grafted tomato seedlings during red and blue LED low light irradiation storage.In the present study, we investigated the effect of blue-light PPFD percentage during storage o­n the photosynthetic protein contents of seedlings.Grafted tomato (Lycopersicon esculentum Mill.) plug seedlings were stored at 10 °C for 21 d under 2 mmol m2-1 s-1 PPFD using mixed light from red and blue LEDs, with different percentages of blue-light PPFD (0, 2, 5, 10 and 50%). o­n the last day of storage, ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and chlorophyll contents in the 1st to 3rd leaves were determined.

Rubisco content in leaves at all leaf positions and chlorophyll content in the 1st leaves increased with increasing the percentage up to 5%, and these contents were unchanged when the percentage exceeded 5%.Chlorophyll content in the 2nd leaves was greater in the 2 to 50% blue-light PPFD treatments than in the 0% blue-light PPFD treatments.Chlorophyll content in the 3rd leaves was constant under all percentage treatments.It can be concluded that the 5 to 50% was the best percentage for the tested percentages.However, in our previous report, no applicable tendency was shown in dry weight of tomato plants cultivated for 14 d following 21 d of storage by increasing the percentage.

These results indicate that the difference in Rubisco and chlorophyll contents caused by different percentages did not affect the growth during cultivation following storage.However, red and blue LED mixed light irradiation with 5 to 50% blue-light PPFD contributed to visual quality improvements because the decrease of chlorophyll content was suppressed during storage of the grafted tomato seedlings.