The importance of sampling immature leaves for the diagnosis of boron deficiency in oilseed rape (Brassica napus cv. Eureka)

Effect of Root Zone Temperature on Oilseed Rape ( Brassica napus ) Response to Boron

“…However, in the present experiment, a smaller S/R ratio at low rather than at high RZT was only evident at d11 in severely low B (0.18-mM) plants (Table 1). Because low B increases S/R ratio (Huang, Ye, and Bell 1996;Marschner, Kirby, and Cakmak 1996), a smaller S/R ratio in the plants at low RZT is attributed more to greater inhibition of root growth relative to the shoot at 208C RZT (Table 1). The stimulation of plant growth by B was more effective at 108C RZT than at warm RZT of 208C as indicated by relative increase of plant DW.…”

“…Plant parts were separated into the YOL (as defined by Huang, Ye, and Bell 1996) and the remainder of the shoot and root (roots were rinsed with B-free water three times for 3 min each). The plant samples were oven dried at 708C, and their dry weights were recorded.…”

“…In one of our previous field experiments (Ye et al 1997), we showed that plant growth of oilseed rape at the seedling stage could be severely inhibited, 25% of plants died in low B soil without B application, and the plant YOL B concentration was less than 10 mg B kg 21 , which is the minimum B concentration required for adequate leaf function (Huang, Ye, and Bell 1996). The further growth of low B plants suffered during low temperature in winter.…”

Boron deficiency increases putrescine levels in tobacco plants

“…Nevertheless, because root growth is more sensitive to boron deficiency than shoot growth ( Fig. 1; Camacho Cristóbal and González-Fontes 1999;Huang et al 1996), the effects of this mineral deficiency on the plant boron concentration would be more marked in leaves than in roots.…”

Preferential translocation of boron to young leaves inArabidopsis thalianaRegulated by theBOR1Gene

“…In oilseed rape, the critical B concentration was 10-14 mg B kg-1 dry weight in the youngest open leaf (Huang et al 1996). Young leaves of soybean required 12 mg B kg-1 dry weight to achieve 90% of their maximal elongation rate (Kirk and Loneragan 1988).…”