Aluminum tolerance in maize: Minimizing pH changes in screening solutions<sup>1</sup>

Jariel, D. M.; Wallace, S. U.; Jones, U. S.; Samonte, H. P.

doi:10.1080/01904169009364131

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“…In previous experiments in which these maize genotypes were screened for tolerance to high levels of AI in nutrient solutions at pH 4.0, PDMR3 was the most tolerant genotype whereas Kalimpos, IPB Varl, UPCA Varl, and Trinidad Grpl&2 were relatively more susceptible to AI toxicity (Jariel et al, 1990). In this study, two of the Al-susceptible genotypes (Kalimpos and UPCA Varl) were also among the most susceptible to pH 3.3 conditions.…”

Section: Discussionmentioning

confidence: 53%

“…In this study, two of the Al-susceptible genotypes (Kalimpos and UPCA Varl) were also among the most susceptible to pH 3.3 conditions. However, the overall ranking of the genotypes in terms of tolerance to Al, based on relative root length (Jariel et al, 1990) was not directly related to the pH-tolerance ranking based on relative top weight at pH 3.3 (Table 1). For example, although At-tolerant PDMR3 had the greatest relative root length at pH 3.3, its relative top weight was less than that of At-susceptible Trinidad Grpl&2 at pH 3.3 in the absence of AI.…”

Section: Discussionmentioning

confidence: 97%

“…Complete nutrient solution was continuously circulated through a 200-L main tank and two 23-L culture tanks, from which the solution overflowed back into the main tank. Solution flow rate was 18 L min-1 • The nutrient solution consisted of7.06 mMKN0 3 , 0.18 mM (NH 4 ) 2 S0 4 , l.O mM CaCl 2 , 0.5 mM MgS0 4 , 0.1 mM KH 2 P04, 10.0 J.LM Fe, as sodium ferric diethylenetriamine pentaacetate (Fe-DTPA), and other micronutrients as used by Jariel et al (1990). The solution was initially ad- justed to the desired pH level (3.3, 4.0, 4.6, 5.5, or 6.…”

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Growth and Nutrient Composition of Maize Genotypes in Acid Nutrient Solutions

et al. 1991

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Crop production in acid soils may be limited by several factors, including low pH. Development of acid‐tolerant cultivars requires information about differences in tolerance to low pH among crop genotypes. To determine whether differential responses to nutrient solution pH occurred among seven maize (Zea mays L.) genotypes, seedlings were grown in a growth chamber in flowing solutions at pH levels ranging from 3.3 to 6.7. Top weights, root lengths and weights, and concentrations of Ca, Mg, Fe, Zn, and Mn in plant tops were determined after 12 d. All genotypes grew well with pH of 4.0 to 5.5, with maximum dry weights of plant tops at pH 4.6 for most of the genotypes. However, all genotypes had necrotic root tips and decreased root lengths at pH 3.3, with relative root lengths (length at pH 3.3/maximum length) ranging from 0.26 to 0.55. Root weights were relatively unaffected by solution pH, but top weights decreased markedly at both pH extremes. Iron concentrations of all genotypes were decreased at pH 6.7, and interveinal chlorosis, resembling Fe deficiency, appeared in the younger leaves. Relative top weights (weight at pH 3.3/maximum weight) averaged 0.79 for Trinidad Grpl&2 and ‘PDMR Comp 1’ and 0.58 for ‘UPCA Varl’, ‘PDMR3’, Kalimpos, and Dikit at pH 3.3, and relative top weights among genotypes were positively correlated (r = 0.85) with Mn concentrations in tops. Based on relative top weight at pH 3.3, the former two genotypes were relatively more tolerant of extremely low pH than those in the latter group.

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