Topic
Offshoot
About: Offshoot is a research topic. Over the lifetime, 30 publications have been published within this topic receiving 215 citations.
Papers
TL;DR: Overall growth of shoots was optimal at or near to the closest spacing, indicating that the advantage of reduced water loss, conferred by dense packing of shoots, greatly outweighs the disadvantage of reduced irradiance.
Abstract: SUMMARY
The effects of a range of shoot spacings (5, 10, 20, 50 mm) on the growth and development of the moss Rhytidiadelphus triquetrus (Hedw.) Warnst. within artificial colonies were studied under conditions of intermittent moisture supply. Growth of the main axis was promoted by decreased spacings of the shoots, probably due to increased resistance to evaporation and prolongation of the period of metabolic activity. Etiolation of shoots occurred at close spacings but no self-thinning was observed. The growth of determinate lateral branches was also stimulated by decreasing shoot spacings but the closest plantings led to inhibited branch growth for shoots in the centres of the colonies. Marginal shoots generally showed less growth of the main axis and branches than central shoots except at the 5 mm spacing.
The numbers of offshoots of indeterminate growth produced at each shoot spacing were low and only a slight trend of increasing offshoot production with increasing spacing was observed over the range 5–20 mm.
Overall growth of shoots was optimal at or near to the closest spacing. Calculated productivity was, therefore, greatest for the densest colonies (1000 shoots dm a) indicating that the advantage of reduced water loss, conferred by dense packing of shoots, greatly outweighs the disadvantage of reduced irradiance.
50 citations
TL;DR: A set of standard measurements are proposed to be used to evaluate agronomic and genetic experiments for heart-of-palm production and will permit comparison of experiments in different environments and with different genotypes, as well as the estimation of useful growth, yield and physiological parameters.
Abstract: Research with pejibaye or peach palm (Bactris gasipaes Kunth) has intensified in various countries due to its increasing use in plantations for heart-of-palm production, as a substitute for the predatory extraction of wild palms Because the species is still understudied, researchers use different traits to evaluate its growth and yield, frequently measured in different ways, making direct comparisons of experiments impossible This paper reviews methods used to analyse growth and yield in pejibaye and proposes a set of standard measurements to be used to evaluate agronomic and genetic experiments for heart-of-palm production The essential vegetative measurements are plant height, leaf number and offshoot number, and the optional measurements are plant diameter, individual and whole plant leaf area and biomass The essential yield measurements are number of harvested hearts-of-palm ("palmitos") and heart-of-palm weight and length (export type only), and the optional measurements are tender stem (basal by-product) weight, tender leaf (apical by-product) weight and heart-of-palm diameter The use of these measurements, as explained here, will permit comparison of experiments in different environments and with different genotypes, as well as the estimation of useful growth, yield and physiological parameters
47 citations
TL;DR: Offshoots from three cultivars of date palm showed different rooting ability, in response to the same root inducing treatment, under misting system, and changes of these parameters during the first month of culture were correlated with the rooting ability.
Abstract: Offshoots from three cultivars of date palm showed different rooting ability, in response to the same root inducing treatment (25 mM indole butyric acid), under misting system. Offshoots from Mejhoul rooted easily and produced numerous roots, while those from Khalt rooted poorly and produced fewer roots. No relationship was found between soluble and ionically bound peroxidase and polyphenoloxidase activities and phenolics level, determined spectrophotometrically in the offshoot leaves prior to the auxin application, and the rooting ability of these cultivars. However, changes of these parameters during the first month of culture were correlated with the rooting ability. In the well rooting cultivar, the soluble peroxidase activity showed a minimum on the 4th day and a maximum on the 10th day, while phenolics level and polyphenoloxidase activity showed an inverse trend. In the poorly rooting cultivar, these parameters changed weakly.
24 citations
20 Jan 2003
TL;DR: It is found that offshoots possessing more roots when removed from the mother palm have a greater ability to regenerate a root system and to establish more successfully and rapidly because over two-thirds of all new roots grew from existing cut roots.
Abstract: Date palm cultivars are clones that must be propagated vegetatively, the grower nearly always relying on offshoots (young plants) that arise from the base of the mother palm. We found that offshoots possessing more roots when removed from the mother palm have a greater ability to regenerate a root system and to establish more successfully and rapidly because over two-thirds of all new roots grew from existing cut roots. Leaf extension is a good above-ground indicator of root growth.
20 citations
TL;DR: Results showed that the foliar application of BA to the stock plants increased the offshoot number quadratically and enhanced the rooting percentages of cuttings and root growth were enhanced by raising the cutting weight class and by the application of naphthaleneacetic acid to the cutting root zone.
Abstract: A research project was conducted at the University of Tuscia, Viterbo (central Italy), to set up a vegetative propagation system for producing diseasefree artichoke transplants (Cynara cardunculus var. scolymus) of the Romanesco type (cultivar C3). The system included the following steps: 1) micropropagated plantlets were grown in a soilless culture year-round in greenhouse conditions, starting at the end of August; 2) stock plants were periodically treated with a chemical growth regulator [6-benzylamino purine (BA)] and then cut back at the collar level to promote offshoot production; 3) offshoots were periodically harvested and cold stored; and 4) cuttings were rooted at the end of spring under conditions of high humidity in multi-pack trays so as to be ready for summer transplanting. Results showed that the foliar application of BA to the stock plants increased the offshoot number quadratically to 200 mg·L–1. The rooting percentages of cuttings and root growth were enhanced by raising the cutting weight class (30–45 g) and by the application of naphthaleneacetic acid (NAA) to the cutting root zone at a rate of 2000 mg·L–1. The percent rotten cuttings increased as the 2 °C cold-storage time increased from 30 to 150 days. Similarly, the percentage of rooting and root growth decreased approximately from 60 to 150 days.
19 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 1 |
| 2020 | 1 |
| 2019 | 2 |
| 2018 | 1 |
| 2017 | 1 |
| 2015 | 2 |