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Sudeep Vyapari, S.M. Scheiber, and E.L. Thralls

growth, and absence of discolored or damaged leaves ( Brand and Leonard, 2001 ). There is little evidence that indicates consumers pay attention to root ball condition at purchase, yet landscape establishment is affected by the condition of root systems

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JinSheng Huang and Paul V. Nelson

31 POSTER SESSION 5 (Abstr. 485-512) Floriculture: Aerial and Root Environments

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William B. Miller, Wanxiang Lu, and Dongqin Tang

might be related to difficulty in epidermal passage of mature leaves. There has been inconsistent interest in the efficacy of ethephon as a root zone-applied PGR ( Briggs, 1975 ; Johnson et al., 1982 ; Miller and Olberg, 2016 ; Miller et al., 2012

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Thomas R. Sinclair, Andrew Schreffler, Benjamin Wherley, and Michael D. Dukes

A key aspect in the establishment of turfgrass sod is rapid rooting or “knitting” of the sod into the underlying soil. Factors that ensure rapid sod rooting include 1) proper soil aeration; 2) adequate moisture in the underlying soil; and 3

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Anjana R. Sharma, Robert N. Trigiano, Willard T. Witte, and Otto J. Schwarz

Cultivars of flowering dogwood (Cornus florida L.) are commercially propagated by vegetative methods such as rooting cuttings or grafting. The results of these methods can be unpredictable. A reliable method of producing dogwoods through tissue culture would be very useful to rapidly produce many copies of important genotypes with horticulturally important characters such as resistance to diseases. One of the primary difficulties of propagating dogwoods (seedlings only) by axillary bud multiplication has been the low rooting efficiency of the microshoots. Various treatments were tried in order to enhance rooting. Eighty-three percent of microshoots harvested between 5 and 7 weeks and treated continuously with 4.9 micromolar IBA rooted after 4 weeks, whereas <20% of microshoots harvested before 5 weeks and after 7 weeks rooted after 4 weeks of continuous exposure to IBA. Differences were also observed in rooting potentials of microshoots that had reddish brown stems rooting at a higher frequency compared to those that had green stems. We hope to translate this method to the propagation of cultivars and potential new releases.

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Arthur Villordon, Don LaBonte, and Julio Solis

Root growth and architecture are important factors that influence plant performance and survival yet are frequently overlooked in horticultural research ( Wright and Wright, 2004 ). Root architecture has previously been defined as referring to the

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Jinhong Yuan, Man Xu, Wei Duan, Peige Fan, and Shaohua Li

the damage of photosynthetic apparatus, imposing a non-stomatal limitation to photosynthesis ( Ennahli and Earl, 2005 ; Farquhar and Sharkey, 1982 ). Partial root zone drying (PRD) is an irrigation strategy that applies water to only one part of the

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Matthew B. Bertucci, David H. Suchoff, Katherine M. Jennings, David W. Monks, Christopher C. Gunter, Jonathan R. Schultheis, and Frank J. Louws

). Research has focused on cucurbit rootstock root system physiology to help explain this improved tolerance; however, research has only been conducted with figleaf gourd ( Cucurbita ficifolia ) and is limited to suboptimal soil temperatures ( Lee et al., 2005

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Eric M. Lyons, Robert H. Snyder, and Jonathan P. Lynch

Healthy root systems are essential to maintain turfgrass quality in the demanding environment of golf greens. Increased rooting of creeping bentgrass on golf greens can increase drought tolerance ( DaCosta and Huang, 2006 ), nitrogen uptake

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Allison H. Justice, James E. Faust, and Julia L. Kerrigan

Shoot tip cuttings are a common means of asexual propagation of ornamental plants. After a cutting is removed from the stock plant, it must form adventitious roots to become a new plant. Adventitious root formation is a complex process regulated by