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Boron accumulation and partitioning in wheat cultivars with contrastingtolerance to boron deficiency

机译：耐缺硼小麦品种中硼的积累和分配

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摘要

Two pot experiments at the Plant Environment Laboratory (PEL), Reading, UK investigated sterility, boron (B) accumulation and B partitioning of wheat cultivars grown with limited B in the growing medium. The first experiment evaluated nine cultivars of spring wheat with diverse field responses to low available soil B, supplied with or without 20 mu M B. A second experiment examined the response of a susceptible (SW-41) and a tolerant (Fang-60) cultivar to B-deficiency. These cultivars were supplied with either 20 mu M B from sowing to flag leaf emergence and no added B thereafter, or 20 mu M B from sowing to maturity. When B was not supplied in the nutrient solution, the number of grains ranged from 4 per ear (cv. BL-1135) to 32 per ear (cv. BL-1249) and sterility of competent florets ranged from 39% to 93%. Boron concentration in the flag leaf at anthesis did not differ greatly when the growing medium contained limited B, but differences between cultivars were evident when B was unlimited. Tolerance of B-deficiency was not related to the B concentration in the flag leaf. Some cultivars produced viable pollen and set grains while others failed to do so at similar B concentrations in the flag leaf. The two contrasting cultivars did not differ much in their pattern of B partitioning when B supply was restricted from flag leaf emergence onwards. Similarly, little evidence was found that the tolerant cultivars translocated B from their leaves, roots or stems when the supply in the growing medium was restricted. The proportion of total B partitioned in different organs was the same irrespective of B supply and cultivar. On average, leaves contained 68% of the total B content in the whole plant compared to 16% in the roots, 10% in the ears and only 6% in the stems. Tolerant or susceptible cultivars of wheat could not be distinguished based on the B concentration and B content of the flag leaf.
机译：在英国雷丁的植物环境实验室（PEL）进行的两个盆栽实验研究了在生长培养基中生长受限的小麦品种的无菌性，硼（B）积累和B分配。第一个实验评估了9个春小麦品种，对低有效土壤B的田间响应各有不同，无论是否供应20μMB。第二个实验研究了易感性（SW-41）和耐性（Fang-60）的响应缺硼的品种。从播种到旗叶出苗向这些品种提供20μM B，此后不再添加B，或者从播种到成熟向它们提供20μMB。当不向营养液中提供B时，谷粒的数量范围为每只耳朵4个（BL-1135品种）到每只耳朵32个（BL-1249品种），而合格小花的不育性范围为39％到93％。当生长培养基中的硼含量有限时，花期剑叶中的硼浓度差异不大，但当硼含量不受限制时，品种间的硼差异明显。缺硼的耐受性与剑叶中的硼含量无关。一些品种产生了可行的花粉并结实了谷物，而另一些品种在旗叶中以类似的B浓度未能做到这一点。当从叶片旗叶出现开始限制了B的供应时，两个相反的品种的B分配模式没有太大差异。同样，几乎没有证据表明当限制生长培养基的供应时，耐性品种会将B从其叶，根或茎中转移出来。硼的分配比例在不同器官中是相同的，而与硼的供应和品种无关。平均而言，叶子占整个植物总B含量的68％，相比之下，根中为16％，耳中为10％，茎中仅为6％。基于旗叶的B浓度和B含量无法区分小麦的耐性或易感品种。

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