ABSTRACT
Soy bean
v arieties commonly gro wn in Kenya`s acidic soils that contain aluminium are SB 97,
SB 19, SB 20 and SB 123. Soy bean grains have high protein content, vitamins and used to
manufacture industrial products. Aluminium toxicity affect growth and physiology of plant
growth . The effects of aluminium chloride solution on plant growth, uptake of mineral nutrients
and di stribution in vegetative parts of soy beans are still not fully understood. The objective of
this study was to investigate the effects of aluminium chloride stress on four varieties of soy
bean grown in Kenya with a view of identifying the tolerant varieties among them to be
recommended for growing in a reas prone to aluminium stress. The experiment was done under
greenhouse conditions. Seeds were planted in 20 litre PVC pot s filled with soil. R andomized
C omplete B lock D esign in a factorial way , with three replicates an d five levels of 0 (control),
25 mg/l, 50 mg/l, 75 mg/l and 10 0 mg /l aluminium chloride concen tration s in tap water was
used. G rowth and physiological paramete rs ; including mineral concentration in leaves,
c hlorophyll fluorescence and photosynthetic pigment contents were measured . The data was
subjected to factorial A nalysis of Variancy and Tukey`s HSD tests at 5% was used to separate
treatment Variety means Growth parameters measured mostly show ed clearly the tolerance
difference levels of the varieties . Aluminium reduced water absorption hence decreasing
productivity. Variety SB 20 concentrated more aluminium in leaves . Some varietal difference
which were no t significant were observe d in mineral accumulation. This indicate that varieties
could be behaving differently in absorption and accumulation of nutrients. Maximum quantum
yield and effective quantum yield had the highest mean value in SB 20. Non photochemical
quenching was high est in SB 123. These implies that varieties behaved diffe re ntly in PSII
impairment activity. Major decrease in t otal chlorophyll with increased aluminium chloride
concentrations was observed in SB 19, SB 97 , and SB 123 s uggest ing selective chlorophyll
photobleaching showing that smaller amounts of energy was delivered for electron transport.
There was a marked decrease in chlorophyll a/b ratio under aluminium chloride solution
treatment. SB 123 had a large r mean value of carotenoids in comparison to SB 20 , SB 19 and
SB 97 . Carotenoids concentration was more at 100 mg /l aluminium chloride concen tration. It
was to assist in transfer of energy and oxygen in accessory pigments. Tukey`s HSD tests
showed no significant difference (p≥0.05) within varieties for physiological parameters
measured. Variety SB 20 and SB 19 were identified to be more tolerant to aluminium stress and
hence recommended for growing in aluminium prone soils . Mineral nutrients accumulation,
photochemical parameters of PSII and photosynthetic pigments parameters measured were
found to be sensitive to a luminium chloride treatment s the later two parameters showed that
AlCl 3 affects the overall rate of photosynthe sis
PATRICK, M (2021). Selected Physiological And Growth Response Of Four Soy Beanvarieties To Aluminium Chloride Stress. Afribary. Retrieved from https://tracking.afribary.com/works/selected-physiological-and-growth-response-of-four-soy-beanvarieties-to-aluminium-chloride-stress
PATRICK, MMAYI "Selected Physiological And Growth Response Of Four Soy Beanvarieties To Aluminium Chloride Stress" Afribary. Afribary, 08 May. 2021, https://tracking.afribary.com/works/selected-physiological-and-growth-response-of-four-soy-beanvarieties-to-aluminium-chloride-stress. Accessed 09 Nov. 2024.
PATRICK, MMAYI . "Selected Physiological And Growth Response Of Four Soy Beanvarieties To Aluminium Chloride Stress". Afribary, Afribary, 08 May. 2021. Web. 09 Nov. 2024. < https://tracking.afribary.com/works/selected-physiological-and-growth-response-of-four-soy-beanvarieties-to-aluminium-chloride-stress >.
PATRICK, MMAYI . "Selected Physiological And Growth Response Of Four Soy Beanvarieties To Aluminium Chloride Stress" Afribary (2021). Accessed November 09, 2024. https://tracking.afribary.com/works/selected-physiological-and-growth-response-of-four-soy-beanvarieties-to-aluminium-chloride-stress