Temperate woody perennials survive to low temperatures in winter entering a dormant stage. Dormancy is not just a survival strategy, since chilling accumulation is required for proper flowering and arbitrates species adaptation to different latitudes. In spite of the fact that chilling requirements have been known for two centuries, the biological basis behind remain elusive. Since chilling acc...

Chlorpropham (isopropyl 3-chlorocarbanilate) is a pesticide used to control sprouting of potatoes during long-term storage. The objective of the present study was to establish the total chlorpropham residue balance (residues in unwashed and washed whole tubers, peeled tubers, peels, boiled and pureed tubers, and washing and cooking waters) for two potato varieties after uniform application as a...

Cassava tubers are an excellent source of carbohydrate and a competitive starch most traded internationally. It is highly desirable raw material for food industrial purpose due to its high dietary content. The economic value cassava products lies in the DMC (dry matter content). roots contain up 80-90 per cent by dry weight 80 starch. Increasing world population, limited land area, changing cli...

BACKGROUND AND AIMS Purple nutsedge (Cyperus rotundus L.) is a major weed of upland crops and vegetables. Recently, a flood-tolerant ecotype evolved as a serious weed in lowland rice. This study attempted to establish the putative growth and physiological features that led to this shift in adaptation. METHODOLOGY Tubers of upland C. rotundus (ULCR) and lowland C. rotundus (LLCR) ecotypes were...

The plant parasitic nematode Heterodera schachtii induces specific syncytial feeding sites in the roots of Arabidopsis thaliana from where it withdraws all required nutrients. Therefore, syncytia have to be well supplied with assimilates and generate strong sinks in the host plant's transport system. Import mechanisms and consequent accumulation of sucrose in syncytia were described recently. I...

Winter dormancy has been extensively studied in many plants, while much less information is available for summer dormancy. Narcissus tazetta var. chinensis is characterized by a prolonged period of summer dormancy during the annual cycle. In the present study, we characterized the nature of dormancy in the controlled growth conditions and investigated the effects of temperature and ethylene on ...

Introduction The biosynthetic reactions of starch synthesis There is strong evidence to indicate that the ADPglucose (ADPGlc) pathway, consisting of the enzymatic reactions catalysed respectively by ADPGlc synthetase (or ADPGlc pyrophosphorylase, EC 2.7.7.27; reaction l), starch synthase (EC 2.4.1.21; reaction 2) and branching enzyme (EC 2.4.1.18; reaction 3), is the predominant if not the sole...

Storage of potatoes is very important because fresh potatoes are available only for a few months in a year. Thus, any treatment such as irradiation that controls sprout growth and extends shelf life of potatoes could be beneficial. In this study, potato sprout inhibition and tuber quality after treatment with various levels of Gamma Irradiation (0, 50, 100 and 150 Gy) on different dates (10, 30...

Cassava (Manihot esculenta Crantz) is the third largest source of calories in tropical countries and sixth most important food crop World. However, short shelf life its storage roots after harvest due to a rapid post-harvest physiological deterioration (PPD) makes be considered as risky product market. The objectives this work were investigate influence two periods on cassava agronomic paramete...

Pyrimidine nucleotides are of general importance for many aspects of cell function, but their role in the regulation of biosynthetic processes is still unclear. In this study, we investigate the influence of a decreased expression of UMP synthase (UMPS), a key enzyme in the pathway of de novo pyrimidine synthesis, on biosynthetic processes in growing potato (Solanum tuberosum) tubers. Transgeni...