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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Study on Carbohydrates Contents in the Terminal Shoots during Bud Dormancy of Three Peach (Prunus persica (L.)Batsch) Cultivars) ผู้เขียน: Wasan Pongsomboon,  ดร.สุรนันต์ สุภัทรพันธุ์, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractIrregular flowering in many peach cultivars is caused by insufficient cold period needed for breaking the dormancy of flower buds. This phenomenon is probably results from insufficient reserved food content in the shoot. The study on reserved carbohydrates contents in the terminal shoot during the dormant stage of three peach cultivars grown at the Royal Ang Khang Station, Amphur Fang, Chingmai Province was conducted. Three peach cultivars of varied chilling requirements namely Flordabelle, Ang Khang White and Ventura were studied by sampling the terminal shoots fortnightly from the beginning of bud dormancy until bud break. The terminal shoot of 5 cm long that bear these excised buds was analysed for reducing sugars (RS) and total non-structural carbohydrates (TNC) contents. The results show that the TNC content in the shoots was high at the first period after the onset of dormancy and sharply decreased thereafter. Similar pattern of changing in that dormant period was seen in the reducing sugar contents. Thereafter the reducing sugar and TNC contents were gradually increased until flowering. However, no relationship was found between the average contents of reducing sugars and TNC in the terminal shoot and the dormancy period of flower buds in these three peach cultivars. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : A Study of Stomatal Behaviour of Avocado ( Persea ameicana Mill. ) Leaves) ผู้เขียน:W. Pongsomboon, A.W. Whiley, S. Subhadrabandhu, R.A. Stephenson สื่อสิ่งพิมพ์:pdf AbstractImmature expanding avocado leaves are relatively sensitive to water loss under highly evaporative environments due to the lack of stomatal control. Stomatal conductance (gs) was determined on young expanding leaves of one-year-old avocado trees cv Hass growing in the glasshouse. The gs measurement was made in controlled air temperature room of 25oC both in the dark and light during leaf growing. Fully expanded leaf size was reached by about 30 days after emergence. Similar behaviours of stomata both in the dark and light were observed, suggesting to be due to an overriding effects of low vapour pressure deficit (VPD) on gs. |
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