Cotton Genomics and Genetics 2015, Vol.6, No.3, 1-5
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Table 2 Mycorrhizal colonization and P and N content of plant
Cotton varieties
AMF_Colonization
(% of root length colonized)
P content,
mg/plant
N content,
mg/plant
AN-Bayaut-2 (control)
0
0.224± 0.014
1.357± 0.012
AN-Bayaut-2+AMF
36.7± 1.2
0.312± 0.033
1.542± 0.02
S-6524(control)
0
0.191± 0.015
1.214± 0.01
S-6524+AMF
19.1± 0.9
0.273± 0.022
1.411± 0.018
Table 3 The effect of inoculation with AMF on cotton yield, centner /ha
Cotton varieties
2011
Difference compare to
control
2012
Difference compare to
control
AN-Bayaut-2 (control)
26.5± 1,2
-
25.9± 2,1
-
AN-Bayaut-2 +AMF
30.7± 1,8
+15.8
31.3± 2,2
+20.8
S-6524 (control)
24.9± 1,0
-
25.3± 1,5
-
S-6524 +AMF
27.9± 1,9
+12.0
28.1± 1,9
+11.1
In AN-Bayaut-2 variety, inoculation with AMF
resulted in increased shoot and root development, the
fresh and the dry weight of the shoot and root (Table
1), the number of capsules, and the shoot P and N
content (Table 2). Also,
Plants when colonized by AM fungi show high degree
of protection by accumulating more and more solute
as it has been indicated in many plants (Evelin et al.,
2009). Similar results were observed by Patale and
Shinde (2012) where they found salinity affected the
plant growth at higher salt concentrations and
inoculated plants were healthier at low to medium salt
concentrations while could obtained necessary
nutrients from the soil.
Accordingly, to combat the poor supply of nutrients
from the soil, mycorrhizal fungi help their host plant
to restore the uptake of mineral nutrients and hence
plant growth (Sharifiet et al., 2007). AM fungal
symbiosis plays a key role in supplying the poor
mobility nutrients like phosphorus to the host plant by
the roots and hence suppress the negative effects of
salt (Feng et al., 2002).
The root and shoot dry weight showed substantial
differences with approximately 1.2-1.3 times greater
than non-inoculated one in both cotton varieties.
Mycorrhiza inoculated plants in medium salinated soil
of Sirdarya region had higher root mass and
colonization compared to non-inoculated cotton plants.
The percentage of root colonization in AN-Bayaut-2
was almost two times more than S-6524; 36.7 % and
19.1 respectively (Table 2).
No any AMF root colonization was found in root
system of control plants, we suppose there were no
any ubiquitous AMF on the soil. According
observations Linderman (1992), the fungi and hosts of
the various types of mycorrhizae are so different, it is
important to recognise that aspects of the symbiosis
may also be very different.
P and root N content of plants biomass (Table 2) were
considerably increased by the mycorrhizal associ-
ations, the highest P and N recorded on AN- Bayaut-2
variety. Similar results were observed by Ortas (2012)
where he revealed mycorrhiza inoculated plants had a
higher nutrient content than non-inoculated plants and
inoculation effectiveness was higher under stress
condition than normal one.
As AN-Bayaut-2 is responsive variety tended to have
higher levels of infection and S-6524 is less
responsive variety tended to have lower levels of
AMF infection in salinated soil condition. AM fungi
play a key role in alleviating the toxicity induced by
salt stress, thus normalizing the uptake mechanism in
plants by supplying the essential nutrients (Carretero
et al., 2008; Porcel et al., 2012).
Microorganisms such as bacteria and fungi increase
plant growth and yield under adverse environmental
conditions as they have the tendency to resist the
damage and hence develop resistance against harmful
effects of salinity stress (Asiya et al., 2014).
