Search Results

You are looking at 1 - 10 of 2,773 items for :

  • root dry weight x
  • Refine by Access: All x
Clear All
Free access

Sven E. Svenson, Fred T. Davies Jr., and Sharon A. Duray

Gas exchange, water relations, and dry weight partitioning of shoot tip cuttings of `Eckespoint Lilo Red' (`Lilo') and `Gutbier V-10 Amy Red' (`Amy') poinsettia (Euphorbia pulcherrima Wind. ex Klotzsch) were studied during the initiation and development of adventitious roots. Net photosynthesis (A) and stomatal conductance (g) of cuttings were initially low and remained low until root primordia formation. Foliar relative water content (RWC) and osmotic potential (ψπ) increased upon formation of root primordia. Following formation of root primordia (2 days before visible root emergence) and concurrent with increasing RWC and ψπ, g increased. As roots initially emerged, A and g increased rapidly and continued to increase with further root primordia development and subsequent emergence of adventitious roots. Cutting stem and leaf dry mass and leaf area increased during the first few days after sticking cuttings. During primordium development and initial root emergence, the highest percent increase in dry weight was accounted for by basal stem sections. AU cuttings of both cultivars rooted and had similar root numbers after 23 days, but `Lilo' cuttings had 15% better rooting and 44% more roots than `Amy' after 15 days. This research supports the hypothesis that formation and elongation of root primordia coincides with increased gas exchange in poinsettia cuttings, and that gas exchange can be used as a nondestructive indicator of adventitious root development.

Free access

Daniel I. Leskovar and Daniel J. Cantliffe

Abbreviations: DAP, days after planting; DAS, days after seeding; LDW, leaf dry weight; OI, overhead-irrigated; RDW, root dry weight; RGR, relative growth rate; SI, subsurface-irrigated; STDW, stem dry weight. 1 Current address: Texas Agricultural

Full access

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

( Juniperus chinensis ) produced greater dry weight of new roots but less shoot growth than undisturbed root balls in loam soil. However, in clay soil, root ball manipulations reduced new root growth ( Blessing and Dana, 1987 ). Objectives of this research

Free access

Jean Masson, Nicolas Tremblay, and André Gosselin

Abbreviations: LAR, leaf area ratio; RSDWR, root: shoot dry weight ratio; SLA, specific leaf area. We thank Yvon Perron, René Pouliot, and France Crochetière for their help. The cost of publishing this paper was defrayed in part by the payment of

Free access

Rebecca L. Darnell, Horacio E. Alvarado-Raya, and Jeffrey G. Williamson

, removing ≈45% of the root dry weight. After root pruning, four root-pruned and four non root-pruned plants were separated into roots and canes (now referred to as floricanes) and fresh weights measured. Plant tissues were dried at 80 °C until constant

Full access

Stephanie A. Beeks and Michael R. Evans

roseus ), and geranium ( Pelargonium × hortorum ) conducted at three locations. Impatiens shoot growth was similar for all containers, but vinca had higher dry root weight when grown in paper containers than when grown in plastic containers. The paper

Full access

Brandon M. Miller and William R. Graves

described increases in root length, shoot diameter, shoot dry weight, and leaf area. Carlson (1974) observed an increase in the number of lateral roots by 24 times in seedlings of Q. rubra after exposure to indole-3-acetic acid (IAA) solution. Kelly and

Full access

Brigitte D. Crawford, John M. Dole, and Ben A. Bergmann

2.5 cm or longer), root fresh weight, and root dry weight. Five cuttings in each rooting compound treatment in each rooting trial, one selected at random from the four cuttings in each experimental unit, were used to record fresh and dry weights of

Full access

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

weighed. Specific root length (SRL; in centimeters per gram) measures root length per dry weight and was calculated by dividing TRL by dry root weight. And the root:shoot ratio was calculated by the dividing dry weight of the harvested root system with the

Free access

John Watson, François Hébert, Eric M. Lyons, Theo Blom, and Katerina S. Jordan

weighed. Root-to-shoot ratio was calculated by dividing root dry weight by cumulative shoot dry weight for each sample at the end of the study. Data analysis. The statistical analysis followed that described in Study 1. Because there were no statistically