Abstract
Climate change has altered rainfall patterns causing waterlogging periods that often negatively affect the performance of horticultural crops in the Andean region in Colombia. An experiment was carried out under greenhouse conditions using three-month-old tamarillo (Solanum betaceum Cav.) seedlings, which were grown under two levels of nitrogen (N) (10 and 150 mg N∙L H2O). At 28 days after transplanting (DAT), waterlogging treatments were established when well-nourished plants (150 mg N L-1 H2O) significantly showed a higher shoot length than poor-nourished plants (10 mg N L-1 H2O) (~20 cm vs. ~10 cm, respectively). Three different periods of waterlogging were performed between 35 and 37, 51 and 55, and 64 and 70 DAT by covering the holes in the plastic pots to ensure a constant water depth. Results showed that well-nourished plants without waterlogging treatments through the experiment’s stress showed a greater shoot length (30 cm), total plant dry weight (7.95 g), Fv/Fm ratio (0.62) and leaf chlorophyll content (37.51 SPAD units) than poor-nourished plants without stress condition (15 cm, 5.57 g, 0.5 and 12.69 SPAD units, respectively) at the end of the experiment. Overall, waterlogging reduced leaf area and nitrogen use efficiency (about 75% and 50%, respectively) in both N levels. However, periods of waterlogging enhanced dry matter partitioning to stems (around 30-35%) in both N levels. This study showed that tamarillo plants are susceptible to landscaping situations where periods of waterlogging can be expected regardless of their N nutritional status.
Highlights
Tamarillo (Solanum betaceum Cav.) is a plant that belongs to Solanaceae family and native from Andean region
Growth parameters Differences were observed on shoot length due to two nitrogen (N) nutritional statuses (10 vs. 150 mg N L-1 H2O) at 28 days after transplanting (DAT)
Regarding the interaction between nutritional status vs. waterlogging stress, it was observed that shoot growth was lower in tamarillo plants subjected to three waterlogging periods in both N treatments at 70 DAT
Summary
Tamarillo (Solanum betaceum Cav.) is a plant that belongs to Solanaceae family and native from Andean region. Flooding has some severe consequences on plant growth and its survival strategies (Phukan et al, 2016) In this sense, the following physiological disorders have been reported under waterlogging: a lower plant growth (Aldana et al, 2014), leaf chlorophyll content (Rao and Li, 2003), and total plant dry weight (Florez-Velasco et al, 2015), as well as changes in the plant water status (Striker et al, 2005). It is important to enlarge the available knowledge on the interaction between nutritional status and waterlogging stress conditions (duration and/or frequency) for the economic and agricultural improvement of tamarillo plants in waterlogging affected areas.
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