scholarly journals Light from below matters: Quantifying the consequences of responses to far‐red light reflected upwards for plant performance in heterogeneous canopies

2020 ◽  
Vol 44 (1) ◽  
pp. 102-113
Author(s):  
Ningyi Zhang ◽  
Arian Westreenen ◽  
Lizhong He ◽  
Jochem B. Evers ◽  
Niels P. R. Anten ◽  
...  
Keyword(s):  
Red Light ◽  
Plant Performance ◽  
Heterogeneous Canopies

scholarly journals Neighbor detection at the leaf tip adaptively regulates upward leaf movement through spatial auxin dynamics

2017 ◽  
Vol 114 (28) ◽  
pp. 7450-7455 ◽  
Author(s):  
Chrysoula K. Pantazopoulou ◽  
Franca J. Bongers ◽  
Jesse J. Küpers ◽  
Emilie Reinen ◽  
Debatosh Das ◽  
...  
Keyword(s):  
3D Modeling ◽  
Light Quality ◽  
Red Light ◽  
Plant Performance ◽  
Leaf Movement ◽  
Heterogeneous Distribution ◽  
Spatial Coordination ◽  
Competitive Success ◽  
Organ Level ◽  
Local Signaling

Vegetation stands have a heterogeneous distribution of light quality, including the red/far-red light ratio (R/FR) that informs plants about proximity of neighbors. Adequate responses to changes in R/FR are important for competitive success. How the detection and response to R/FR are spatially linked and how this spatial coordination between detection and response affects plant performance remains unresolved. We show in Arabidopsis thaliana and Brassica nigra that localized FR enrichment at the lamina tip induces upward leaf movement (hyponasty) from the petiole base. Using a combination of organ-level transcriptome analysis, molecular reporters, and physiology, we show that PIF-dependent spatial auxin dynamics are key to this remote response to localized FR enrichment. Using computational 3D modeling, we show that remote signaling of R/FR for hyponasty has an adaptive advantage over local signaling in the petiole, because it optimizes the timing of leaf movement in response to neighbors and prevents hyponasty caused by self-shading.

scholarly journals Filtering Light-Emitting Diodes to Investigate Amber and Red Spectral Effects on Lettuce Growth

Plants ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1075
Author(s):  
Bo-Sen Wu ◽  
Sarah MacPherson ◽  
Mark Lefsrud
Keyword(s):  
Plant Growth ◽  
Photosynthetic Activity ◽  
Light Emitting Diode ◽  
Red Light ◽  
Plant Productivity ◽  
Plant Performance ◽  
Light Emitting ◽  
Amber Light ◽  
Light Spectra ◽  
Future Work

Red and blue light are the principal wavelengths responsible for driving photosynthetic activity, yet amber light (595 nm) has the highest quantum efficiency and amber-rich high pressure sodium lamps result in superior or comparable plant performance. On this basis, we investigated how lettuce plant growth and photosynthetic activity were influenced by broad and narrow light spectra in the 590–630 nm range, by creating amber and red light-emitting diode (LED) spectra that are not commercially available. Four different light spectra were outfitted from existing LEDs using shortpass and notch filters: a double peak spectrum (595 and 655 nm; referred to as 595 + 655-nm light) that excluded 630-nm light, 595-nm, 613-nm, and 633-nm light emitting at an irradiance level of 50 W·m−2 (243–267 µmol·m−2·s−1). Shifting LED wavelengths from 595 nm to 633 nm and from 595 nm to 613 nm resulted in a biomass yield decrease of ~50% and ~80%, respectively. When 630-nm light is blocked, lettuce displayed expanded plant structures and the absence of purple pigmentation. This report presents a new and feasible approach to plant photobiology studies, by removing certain wavelengths to assess and investigate wavelength effect on plant growth and photosynthesis. Findings indicate that amber light is superior to red light for promoting photosynthetic activity and plant productivity, and this could set precedence for future work aimed at maximizing plant productivity in controlled environment agriculture.

scholarly journals The Effects of Conditioning Strawberry Plug Plants under Altered Red/Far-red Light Environments

HortScience ◽  
2005 ◽  
Vol 40 (5) ◽  
pp. 1263-1267 ◽  
Author(s):  
Brent L. Black ◽  
Harry J. Swartz ◽  
Gerald F. Deitzer ◽  
Bryan Butler ◽  
Craig K. Chandler
Keyword(s):  
Production System ◽  
Day Treatment ◽  
Red Light ◽  
Field Performance ◽  
Cold Climate ◽  
Plant Performance ◽  
First Year ◽  
Greenhouse Production ◽  
Plastic Films ◽  
Short Day

The effect of altered red/far-red light environment on subsequent field performance of strawberry plug plants was tested. Two wavelength-selective plastic films were compared to neutral shade and full-sun control for conditioning `Chandler' strawberry plug plants before transplanting to a winter production system. The following year, plug plants of `Chandler', `Sweet Charlie', and `Allstar' were conditioned under the same treatments, with the addition of a continuous incandescent light and a short-day photoperiod, and plant performance was followed in the winter production system in Florida, a cold-climate annual hill system in Maryland, and in a low-input greenhouse production system. During the first year, the red light-filtering film slightly advanced fruiting in Florida. However, during the second year, the effect of the red light-filtering film was not significant, and a short-day treatment resulted in a greater reduction in runnering and increased early crown and flower development. For June-bearing strawberry plants maintained above 20 °C, altering the red/far-red environment did not consistently advance flowering.

Effect of planting time on the performance of broccoli under Mizoram conditions

2017 ◽  
Vol 17 (1) ◽  
pp. 15-18
Author(s):  
Donnie Lalfakzuala Kawlni ◽  
Chhungpuii Khawlhring
Keyword(s):  
Commercial Production ◽  
Plant Performance ◽  
Average Weight ◽  
Plant Spacing ◽  
Vegetable Crop ◽  
Marketable Yield ◽  
Sowing Time ◽  
Planting Time ◽  
Significant Difference ◽  
Cultural Requirements

Broccoli (Brassica oleracea var. italica), a popular vegetable crop, has one of the most exacting climatic and cultural requirements, which limit its commercial production to a few favored locations. A field experiment was conducted at Mizoram University, Tanhril, Mizoram during winter of 2013/2014 to find out the effect of time of sowing on plant performance and yield of broccoli. Six sowing time was done viz. 17 October (T1), 24 October (T2), 31 October (T3), 7 November (T4), 14 November (T5) and 21 November (T6) with plant spacing of 45cm x 45cm. Yield and yield contributing characters were significantly influenced by the planting time. Highest average weight of marketable curd per plant (199.20 g) was obtained from T2, whereas lowest average weight obtained from T6 (75 g). The influence of planting time also showed significant difference on the calculated yield (tonnes per hectare) of broccoli, in which T2 showed highest marketable yield of 9.83 t/ha.

Postnatal growth rate and gonadal development in circadian tau mutant hamsters reared in constant dim red light

Reproduction ◽  
2000 ◽  
pp. 327-330 ◽  
Author(s):  
RJ Lucas ◽  
JA Stirland ◽  
YN Mohammad ◽  
AS Loudon
Keyword(s):  
Time Course ◽  
Red Light ◽  
Somatic Growth ◽  
Postnatal Growth ◽  
Gonadal Development ◽  
Testicular Development ◽  
Wild Type ◽  
Similar Time ◽  
Syrian Hamsters ◽  
Body Weights

The role of the circadian clock in the reproductive development of Syrian hamsters (Mesocricetus auratus was examined in wild type and circadian tau mutant hamsters reared from birth to 26 weeks of age under constant dim red light. Testis diameter and body weights were determined at weekly intervals in male hamsters from 4 weeks of age. In both genotypes, testicular development, subsequent regression and recrudescence exhibited a similar time course. The age at which animals displayed reproductive photosensitivity, as exhibited by testicular regression, was unrelated to circadian genotype (mean +/- SEM: 54 +/- 3 days for wild type and 59 +/- 5 days for tau mutants). In contrast, our studies revealed a significant impact of the mutation on somatic growth, such that tau mutants weighed 18% less than wild types at the end of the experiment. Our study reveals that the juvenile onset of reproductive photoperiodism in Syrian hamsters is not timed by the circadian system.

Inhibition of Various Steps in the Replication Cycle of Vesicular Stomatitis Virus Contributes to Its Photoinactivation by AlPcS4 or Pc4 and Red Light

1999 ◽  
Vol 69 (3) ◽  
pp. 353 ◽  
Author(s):  
Anne C. E. Moor ◽  
Angeline E. Wagenaars-van Gompel ◽  
Ralph C. A. Hermanns ◽  
Jannes van der Meulen ◽  
Jolanda Smit ◽  
...  
Keyword(s):  
Vesicular Stomatitis Virus ◽  
Red Light ◽  
Replication Cycle ◽  
Vesicular Stomatitis
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