BACKGROUND AND AIMS Expected life history trade-offs associated with sex differences in reproductive investment are often undetected in seed plants, with the difficulty arising from logistical issues of conducting controlled experiments. By controlling genotype, age and resource status of individuals, a bryophyte was assessed for sex-specific and location-specific patterns of vegetative, asexua...

The Marquillo x Kenya Farmer 1 "grass-clump" dwarf selection of Triticum aestivum L. was grown under continuous 2000 foot candle light and several regimes of alternating 16 degrees and 26 degrees temperatures combined in total cycle lengths of 6, 12, 24, or 48 hr. Plants at 26 degrees grew as normal wheat. Those exposed to 0.25 to 2 hr of 16 degrees per cycle showed typical "grass-clump" dwarf ...

Citrus reproductive biology is complex. One of its characteristic features parthenocarpy that enables seedless fruit production. and self-incompatibility knowledge only partial sometimes discrepant. Increasing such relevant for better managing cultivated varieties improving the selection parents in breeding strategies to recover as mandarins. This work develops an efficient protocol characteriz...

under condition of limited water supply, determination of minimum water requisite to keep potential yield should be considered as an important target. with this respect, a field experiment was conducted at research farm of university college of agriculture and natural resources, university of tehran, in 2012-2013, karaj, iran. the experiment was conducted in a split plot, based on randomized co...

The sensitivity of soybean [Glycine max (L.) Merr.] main stem node accrual to ambient temperature has been documented in greenhousegrown plants but not with fi eld-grown plants in the north-central United States. Biweekly V-node and R-stage, stem node number, internode length, and other traits were quantifi ed in an irrigated split-plot, four-replicate, randomized complete block experiment cond...

The cabbage aphid, Brevicoryne brassicae L. (Hemiptera: Aphididae), is a perennial pest that specializes on plants of the Brassicaceae family, attacking winter canola (Brassica napus L.) mainly during and after flowering. Under field conditions, cabbage aphid colonizes the upper flowering canopy. Population dynamics of aphids in the flowering canopy could be regulated by differences in either p...

salinity is one of the most restrictions in plant growth in dry and semi dry land which effects production of many crops such as sesame. in order to study the phenology and morphology characteristics of 43 ecotypes and line of sesame (sesamum indicum l.) under salinity of irrigation water (5.2 ds.m-1) a field experiment was conducted at research farm of center of excellence for special crops, f...

A greenhouse experiment was conducted to investigate the effect of flooding on two tomato cultivars and two wild related species. Forty days old tomato plants were subjected to a continuous flooding stress of different durations: 0, 2, 4 and 8 days. Plant pots were placed inside larger plastic pots; they were irrigated with excessive quantity of tap water at 25C so that the level of water above...

Published in Agron. J. 104:1702–1709 (2012) Posted online 17 Sept. 2012 doi:10.2134/agronj2012.0199 Copyright © 2012 by the American Society of Agronomy, 5585 Guilford Road, Madison, WI 53711. All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and re...

To test several predictions of a model of linear, size-dependent reproductive output in plants, we analyzed the relationship between shoot vegetative (v) and reproductive (r) mass in five experiments on Solidago altissima from an invading population in Switzerland. There was large environmentally-induced and genetic variation in r and v. A large amount of variation in r could be explained by va...