Nutrition of Container-Grown Christmas Cacti

Spurway, Mervyn I.; Thomas, Michael B.

doi:10.1081/pln-100103669

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…This may be the result of an ecological push to reproduce when the environment becomes less favorable or in response to a seasonal change as in low‐temperature–induced flowering (Ali and Lovatt, 1995). Excess N may result in either no effect (Schultheis and Dufault, 1994) or in a delay of duration, magnitude, and time to flowering (Spurway and Thomas, 2001). Others have reported decreased time to flowering under N deficiency (Xu et al, 2001; Kostenyuk et al, 1999).…”

Section: Resultsmentioning

confidence: 99%

Characterizing the Environmental Response of a Gibberellic Acid–Deficient Rice for Use as a Model Crop

et al. 2004

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isms and other species. This work has culminated in the published genomes of the nematode (The C. elegans Se-Rice (Oryza sativa L.) is a useful model crop plant. Rice was the quencing Consortium, 1998), fruit fly (Adams et al., first crop plant to have its complete genome sequenced. Unfortu-2000), the common mustard weed (The Arabidopsis Genately, even semidwarf rice cultivars are 60 to 90 cm tall, and large nome Initiative, 2000), and humans (Homo sapiens) (Inplant populations cannot be grown in the confined volumes of greenhouses and growth chambers. We recently identified an extremely ternational Human Genome Sequencing Consortium, short (20 cm tall) rice line, which is an ideal model for larger rice 2001) among a few others. The National Institutes of cultivars. We called this line 'Super Dwarf' rice. Here we report the Health (NIH) has provided links to research using these response of Super Dwarf to temperature, photoperiod, photosynthetic model organisms (www.nih.gov/science/models/; veriphoton flux (PPF), and factors that can affect time to head emergence. fied 29 Apr. 2004). Rice is the first crop plant to have Vegetative biomass increased 6% per degree Celsius, with increasing a complete genome sequence available for study (Yu temperature from 27 to 31؇C. Seed yield decreased by 2% per degree et al., 2002; Goff et al., 2002). Sequencing these genomes Celsius rise in temperature, and as a result, harvest index decreased are remarkable scientific achievements, but the next from 60 to 54%. The time to heading increased by 2 d for every hour challenge is to relate form with function (Fields et al., above a 12-h photoperiod. Yield increased with increasing PPF up 1999). to the highest level tested at 1800 mol m Ϫ2 s Ϫ1 (12-h photoperiod; The study of functional genomics will benefit from 77.8 mol m Ϫ2 d Ϫ1 ). Yield efficiency (grams per mole of photons) inmodel crops that facilitate laboratory studies. Small orcreased to 900 mol m Ϫ2 s Ϫ1 and then slightly decreased at 1800 mol ganisms lend themselves to study in small spaces. Arabim Ϫ2 s Ϫ1 . Heading was delayed by addition of gibberellic acid 3 (GA 3 ) dopsis thaliana is a prime example. Researchers have to the root zone but was hastened under mild N stress. Overall, short stature, high yield, high harvest index, and no extraordinary environ-capitalized on its compact size (10 cm tall), rapid life mental requirements make Super Dwarf rice an excellent model plant cycle, and massive numbers of seeds produced from for yield studies in controlled environments.

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Section: Resultsmentioning

confidence: 99%

Characterizing the Environmental Response of a Gibberellic Acid–Deficient Rice for Use as a Model Crop

et al. 2004

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“…Nitrate application in concentrations of 0.8; 4 or 16 mM N on Opuntia fícus-indica also did not reflect the growth of the species; however Nerd & Nobel (1995) related the increase of nitrate internal concentrations in plants as a reserve for the growth of new vegetative organs (luxury consumption). Spurway & Thomas (2001), studying the effect of N in growth and flowering of epiphytic cactus (Schlumbergera x buckleyi), observed that in the absence of N the plants showed chlorosis, smaller size and flowering; at intermediate doses (2,370 g N/m 3 /month) an increase of growth and flowering occurred, whereas high doses of N contributed to growth inhibition when compared to control (-19.7% of dry matter weight) and delayed flowering. The species of cacti submitted to nitrogen fertilization with 8-16 mM N increased photosynthesis, with an increase of CO 2 absorption in approximately 400% (Nobel & Barrera, 2004).…”

Section: Resultsmentioning

confidence: 99%

Urea concentration on vegetative development and nutrition of Cactaceae epiphytic species

et al. 2016

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Rhipsalis paradoxa, Rhipsalis baccifera and Hatiora salicornioides are epiphytic cacti from the Atlantic Forest. They have a great ornamental potential due to the exotic characteristic of their joints (stems segments). The study aimed to evaluate the growth and development of roots and shoots as well as macronutrient and micronutrient contents in the joints of these species fertilized with different concentrations of urea as a nitrogen source. The study also analyzed the importance of the root system on nitrogen absorption. Plants were weekly irrigated with modified Hoagland & Arnon solutions with 0, 16.7, 33.3, 49.9 or 66.6 mM N applied as urea. After 180 days of cultivation, plants were separated into joints and roots for biometric and biomass measures, as well as macronutrient and micronutrient analysis of joints. The experimental design was randomized blocks, with five treatments, four blocks and five plants per plot, for each species. Data were submitted to analyses of variance and regression. R. baccifera showed the highest plant length and number of joints in 29.94 and 40.82 mM N, respectively, H. salicornioides showed the highest length and number of joints in 48.29 and 45.68 mM N respectively. For R. paradoxa, the highest length was in 66.6 mM N. The lowest values for plant length and number of joints were observed in the absence of N, for all species. High nitrogen concentrations in the solution increased the N concentration in joints of R. baccifera, R. paradoxa and H. salicornioides by 24, 19 and 13 g N/kg dry mass, respectively. The roots of epiphytic cacti, besides the function of fixing the plant on substrate (phorophyte), are functional for nutrient absorption, and the best results were obtained in 30.05 to 66.60 mM N in the nutrient solution.

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Nutrition of Container-Grown Christmas Cacti

Cited by 2 publications

References 2 publications

Characterizing the Environmental Response of a Gibberellic Acid–Deficient Rice for Use as a Model Crop

Characterizing the Environmental Response of a Gibberellic Acid–Deficient Rice for Use as a Model Crop

Urea concentration on vegetative development and nutrition of Cactaceae epiphytic species

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