Abscission as a Mobilization Phenomenon'2
نویسنده
چکیده
Stun1n1a1ry. 'I'lle possibility thlat leaf abscission miliglht involve a niobiliza-tion p)heloiil(iiofl lea(ling to a localized cellular seniescenlce as examilie( lbv following (lr weight clhaniges. chlorophyll conltenit, anid proteini levels in l)roxinmal and (listal tisstue of excised pieces of bean petioles from I'hlaseolius 70dlygos L. var. Red Kidlney. Nucleic aci(d levels w-ere determinied as were l)hosl)hate 1)ool sizes in conljuniictioll with 'P labelillg patterns. Each of these parameters inclicated a mlobilization inito the tissues proximal to the zolle of cellular sel)aration at the expense of the distal tissues. suggestilng that miobilizatioll aiicl the consequen,t developmiienit of celltular selnescenice provide a coml)onent in the lproces.s of bean leaf abscission.
منابع مشابه
Abscission: the role of aging.
Excision of Phaseolus vulgaris L. c.v. Red Kidney abscission zone explants results in senescence, mobilization, and abscission. Because these processes take place at about the same time, there has been some question as to whether they are causally related or are occurring in an independent but simultaneous fashion. Data presented here suggest that the latter interpretation is correct. After abs...
متن کاملEarly gene expression events in the laminar abscission zone of abscission-promoted citrus leaves after a cycle of water stress/rehydration: involvement of CitbHLH1
Leaf abscission is a common response of plants to drought stress. Some species, such as citrus, have evolved a specific behaviour in this respect, keeping their leaves attached to the plant body during water stress until this is released by irrigation or rain. This study successfully reproduced this phenomenon under controlled conditions (24h of water stress followed by 24h of rehydration) and ...
متن کاملCalyx biochemical changes and possibility of reducing thomson orange June drop by nutrition elements and growth regulators
Summer fruit drop (June drop) is one of the main reasons for low yield in some citrus varieties in northern Iran. Recognition of physiological changes in fruit abscission zone (calyx) and application of suitable treatments would reduce or control abscission. Hence, the changes of auxin, cellulose, and polygalacturonase in calyx of Thomson navel fruitlets were measured and their relations with a...
متن کاملEffect of Exogenous Application of L-arginine and Sodium Nitroprusside on Fruit Abscission and Physiological Disorders of Pistachio (Pistacia Vera L.) Scions
Pistachio yield are often negatively affected by some physiological problems such as abscission of inflorescence buds and fruits, deformed or blank nuts, and non-split shells. In the present study the effect of exogenous application of arginine (Arg) (a substrate for nitric oxide (NO) synthase) and sodium nitroproside (SNP), as a NO-donor was investigated on yield production, fruit and inflores...
متن کاملبررسی تاثیر ریتم شبانه روزی بر ترشح آدرنالین و نور آدرنالین و ارتباط ان با میزان موبیلیزاسیون سلول های بنیادی CD34
Hematopoietic stem cells (HSCs), which have the ability to differentiate into various types of blood cell lines, are usually separate from the bone marrow. But these cells are also present in a small amount in the peripheral blood, and their amounts increase in blood following injection of G-CSF. However, the mechanism involved in moving HSCs under the influence of G-CSF is unknown. The aim of ...
متن کامل