Silva-Díaz Cecilia, Ramírez David A, Rinza Javier, Ninanya Johan, Loayza Hildo, Gómez René, Anglin Noelle L, Eyzaguirre Raúl, Quiroz Roberto
International Potato Center (CIP), Headquarters P.O. Box 1558, Lima 12, Peru.
Water Resources Doctoral Program, Universidad Nacional Agraria La Molina (UNALM), Av. La Molina s/n, Lima 12, Peru.
Plants (Basel). 2020 Jun 23;9(6):787. doi: 10.3390/plants9060787.
Crop efficiencies associated with intercepted radiation, conversion into biomass and allocation to edible organs are essential for yield improvement strategies that would enhance genetic properties to maximize carbon gain without increasing crop inputs. The production of 20 potato landraces-never studied before-was analyzed for radiation interception ( ε i ), conversion ( ε c ) and partitioning ( ε p ) efficiencies. Additionally, other physiological traits related to senescence delay (normalized difference vegetation index (NDVI) s l p ), tuberization precocity ( t u ), photosynthetic performance and dry tuber yield per plant (TY) were also assessed. Vegetation reflectance was remotely acquired and the efficiencies estimated through a process-based model parameterized by a time-series of airborne imageries. The combination of ε i and ε c , closely associated with an early tuber maturity and a NDVI s l p explained 39% of the variability grouping the most productive genotypes. TY was closely correlated to senescence delay (r P e a r s o n = 0.74), indicating the usefulness of remote sensing methods for potato yield diversity characterization. About 89% of TY was explained by the first three principal components, associated mainly to t u , ε c and ε i , respectively. When comparing potato with other major crops, its ε p is very close to the theoretical maximum. These findings suggest that there is room for improving ε i and ε c to enhance potato production.
与截获辐射、转化为生物量以及分配到可食用器官相关的作物效率，对于提高产量的策略至关重要，这些策略旨在增强遗传特性，在不增加作物投入的情况下最大限度地提高碳获取量。对20个以前从未研究过的马铃薯地方品种的生产进行了辐射截获效率（εi）、转化效率（εc）和分配效率（εp）分析。此外，还评估了与衰老延迟相关的其他生理性状（归一化植被指数（NDVI）slp）、块茎形成早熟性（tu）、光合性能以及单株干块茎产量（TY）。通过遥感获取植被反射率，并通过基于过程的模型估算效率，该模型由一系列航空图像进行参数化。εi和εc的组合与块茎早熟和NDVI slp密切相关，解释了最具生产力基因型变异的39%。TY与衰老延迟密切相关（皮尔逊相关系数r = 0.74），表明遥感方法在表征马铃薯产量多样性方面的有用性。约89%的TY由前三个主成分解释，分别主要与tu、εc和εi相关。将马铃薯与其他主要作物相比，其εp非常接近理论最大值。这些发现表明，提高εi和εc以提高马铃薯产量仍有空间。
