Potential decreases in crop yield from reductions in bee-mediated pollination services threaten food production demands of a growing population. Many fruit and vegetable growers supplement their fields with bee colonies during crop bloom. The extent to which crop production requires supplementary pollination services beyond those provided by wild bees is not well documented. Pumpkin, Cucurbita ...

introduction: pumpkin is one of the agricultural products that despite its very low price, is known as a rich source of carotenoids with high antioxidant activity. iran is one of the good producers of pumpkin at the world with fifth rank which is cultivated at provinces like mazandaran, guilan, khorasan, and hamedan and so on extensively. pumpkin is almost available for entire the year but many...

Lippincott, Barbara B. (Northwestern University, Evanston, Ill.), and James A. Lippincott. Characteristics of Agrobacterium tumefaciens auxotrophic mutant infectivity. J. Bacteriol. 92:937-945. 166.-Mutants of Agrobacterium tumefaciens auxotrophic for adenine, methionine, or asparagine are less infectious than the wild-type strain B6 from which they were derived and show increased infectivity o...

The tumor-initiating ability of Agrobacterium tumefaciens was enhanced two- to threefold after a preinoculation exposure to the phenothiazine derivative chlorpromazine hydrochloride. The mean number of tumors initiated per viable bacterium on pinto bean leaves was greatest after a 1-hr exposure to 15 mug of the drug per ml. Chlorpromazine had no significant effect on tumor initiation when appli...

Several plant extracts were evaluated against obliquebanded leafroller larvae to determine potential toxicity and antifeedant effects. Two of the plant extracts exhibited contact toxicity; the LC50 value of Humulus lupulus extract against 3 rd instar larvae was 24.5 μg / insect. In a no choice context, larval survivorship was reduced 23 57 % after feeding on a meridic pinto bean diet treated wi...

The effects of grafting on Na and Cl(-) uptake and distribution in plant tissues were quantified in a greenhouse experiment using six combinations of melon (Cucumis melo L. cv. Arava) and pumpkin (Cucurbita maxima Duchesne×Cucurbita moschata Duchesne cv. TZ-148): non-grafted, self-grafted, melons grafted on pumpkins, and pumpkins grafted on melons. Total Na concentration in shoots of plants wit...

Acid-soluble nucleotides of unifoliate leaves of Pinto bean plants (Phaseolus vulgaris L.) were determined at young, mature, and senescent stages of development. At least 25 components could be distinguished on the basis of inorganic phosphorus determinations and 37 or more fractions on the basis of (32)P labeling, with adenosine di- and triphosphates accounting for 60% of the total moles of nu...