Photoperiod and root-zone temperature: Interacting effects on growth and mineral nutrients of maize
Plant and Soil(1993)
摘要
Factorial effects of photoperiod (6, 12 and 18 h) and root-zone temperatures (9, 15 and 21C) on the growth and mineral nutrient
concentration and partitioning in maize (Zea mays L.) were investigated. Strong interactions were observed between photoperiod and root-zone temperature on the growth and
concentration of numerous mineral elements in the plant tops and roots. For example, a threefold increase in photoperiod (from
6 to 18 h) did not affect the growth of tops or roots if the root-zone temperature was 9C but increased them each by eightfold
if the root-zone temperature was 21C. On the other hand, raising the root-zone temperature from 9 to 21C increased the growth
of tops and root each by ca. threefold when plants were grown with 6 h of light. At 18 h photoperiod, however, plant growth
was increased 20- to 30-fold by the same rise in the root-zone temperature. The concentrations of different mineral elements
in the roots and tops were affected quite differently by the interacting effects of photoperiod and root-zone temperature.
In general, increasing the photoperiod at a given root-zone temperature decreased the concentrations of elements while increasing
the root-zone temperature at a given photoperiod increased the concentrations of most elements in both roots and tops. The
exceptions were K and B which reacted opposite to each other: K concentration in both tops and roots was relatively insensitive
to photoperiod but very sensitive to root-zone temperature and the reverse was true for boron. The relative insensitivity
of plant growth to increased day length as long as the roots are subjected to suboptimal (low) soil temperatures may have
survival significance and point to the predominant role of root temperature over that of day length in the early growth of
maize. A possible mechanism by which photoperiod and root-zone temperature might interactively alter the nutrient uptake by
the roots is discussed.
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关键词
zea mays l.,photoperiod,mineral nutrition,temperature,stress physiology,interaction effect
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