scholarly journals Tree architecture, light interception and water use related traits are controlled by different genomic regions in an apple tree core collection

2022 ◽  
Aude Coupel‐Ledru ◽  
Benoît Pallas ◽  
Magalie Delalande ◽  
Vincent Segura ◽  
Baptiste Guitton ◽  
Oecologia ◽  
1983 ◽  
Vol 59 (2-3) ◽  
pp. 178-184 ◽  
M. M. Caldwell ◽  
T. J. Dean ◽  
R. S. Nowak ◽  
R. S. Dzurec ◽  
J. H. Richards

Weed Science ◽  
2003 ◽  
Vol 51 (4) ◽  
pp. 523-531 ◽  
Rafael A. Massinga ◽  
Randall S. Currie ◽  
Todd P. Trooien

2008 ◽  
Vol 5 (1) ◽  
pp. 165-179 ◽  
Vincent Segura ◽  
Charles-Eric Durel ◽  
Evelyne Costes

1991 ◽  
Vol 69 (2) ◽  
pp. 295-300 ◽  
Ido Schechter ◽  
D. C. Elfving ◽  
J. T. A. Proctor

Trees of apple (Malus domestica Borkh.) with 'Starkspur Supreme Delicious' as the scion grafted on nine different rootstocks (Ottawa 3, M.7 EMLA, M.9 EMLA, M.26 EMLA, M.27 EMLA, M.9, MAC-9, MAC-24, OAR 1) were studied in their 8th and 9th years. Canopy seasonal development and its light interception followed by fisheye (hemispherical) photography showed that rootstock affected the amount of structural wood, the rate of canopy development, and final leaf area. However, rootstock did not affect the sigmoidal pattern of canopy development. Light interception was linearly correlated with tree dimensions and yield. Leaf net photosynthesis (Pn) of trees on dwarfing rootstocks tended to be lower than Pn rates of trees on more vigorous rootstocks. Rootstock did not affect the scion Pn response to different illumination levels. Shoot leaves, spur leaves on spurs without fruit (S − F), and spur leaves on spurs with fruit (S + F) from trees on M.26 EMLA and OAR 1 showed no differences in Pn rates. However, for both rootstocks, shoot leaves had the highest Pn rate, S + F the lowest, and S − F leaves had intermediate values. Key words: light interception, fisheye photography, leaf type.

2010 ◽  
Vol 61 (11) ◽  
pp. 892 ◽  
S. G. L. Kleemann ◽  
G. S. Gill

A 3-year field study was undertaken to investigate the effect of row spacing on vegetative growth, grain yield and water-use efficiency of wheat. All 3 years of the study experienced 21–51% below-average rainfall for the growing season. Widening row spacing led to reduced biomass and tillers on per plant basis which could be related to the reduction in light interception by the wheat canopy in the wide rows which in turn could have reduced assimilate production. Reduction in vegetative growth in 54-cm rows translated into a significant reduction in grain yield which was strongly associated (r2 = 0.71) with the loss of spike density. The pattern of crop water use (evapotranspiration, ET) during the growing season was very similar for the three row-spacing treatments. However, there was some evidence for slightly lower ET (~5%) in 54-cm rows in two growing seasons. More importantly, there was no evidence for increased ET during the post-anthesis phase in wide rows as has been speculated by some researchers. Over the 3 years of the study, grain yield declined by 5–8% as row spacing increased from 18 to 36 cm and by a further 12–20% as row spacing increased from 36 to 54 cm. There was a consistent decline in water-use efficiency for grain (WUEG) with increasing row spacing over the 3 years. WUEG declined by 6–11% as crop spacing increased from 18 to 36 cm and declined further by 12–15% as row spacing increased to 54 cm. Lower light interception at wider row spacing could have reduced assimilate production by wheat as well as increased soil evaporation due to lower shading of the soil surface in more open canopies. Growers adopting wider row spacing on these relatively heavy textured soils are likely to experience some reduction in grain yield and WUEG. However, some growers may be prepared to accept a small yield penalty from intermediate row spacing as a trade-off for increased stubble retention and soil health.

2016 ◽  
Vol 60 (4) ◽  
pp. 757-766
V. Roja ◽  
S. Patil ◽  
D. A. Deborah ◽  
A. Srividhya ◽  
N. Ranjitkumar ◽  

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